https://www.thinkwiki.org/w/api.php?action=feedcontributions&feedformat=atom&user=MilosThinkWiki - User contributions [en]2026-05-03T21:10:34ZUser contributionsMediaWiki 1.31.12https://www.thinkwiki.org/w/index.php?title=How_to_control_fan_speed&diff=26006How to control fan speed2006-10-25T04:00:42Z<p>Milos: Added comment - "disengaged" mode is not disengaged on A31s</p>
<hr />
<div>This page discusses methods for controlling the system fan.<br />
<br />
==For Linux==<br />
===Using a patched kernel===<br />
<br />
The [[Patch for controlling fan speed]] provides a convenient interface via {{path|/proc/acpi/ibm/fan}}.<br />
<br />
Manual speed control can be done through the [[patch for controlling fan speed]]:<br />
<br />
'''#cat /proc/acpi/ibm/fan'''<br />
status: enabled<br />
level: auto<br />
speed: 4219<br />
commands: enable, disable, level <level><br />
(<level> is 0-7, auto or disengaged)<br />
<br />
'''#echo level 2 > /proc/acpi/ibm/fan'''<br />
<br />
'''#cat /proc/acpi/ibm/fan'''<br />
status: enabled<br />
level: 2<br />
speed: 3142<br />
commands: enable, disable, level <level><br />
(<level> is 0-7, auto or disengaged)<br />
<br />
===Using a stock kernel===<br />
<br />
If you have the [[ibm-acpi]] module loaded with <tt>experimental=1</tt>, you can control the fan without patching the kernel by directly writing to the relevant embedded controller register using {{path|/proc/acpi/ibm/ecdump}}. <br />
<br />
For example:<br />
<br />
{{cmdroot|echo 0x2F 0x00 > /proc/acpi/ibm/ecdump}} (fan off)<br />
<br />
{{cmdroot|echo 0x2F 0x02 > /proc/acpi/ibm/ecdump}} (low speed)<br />
<br />
{{cmdroot|echo 0x2F 0x04 > /proc/acpi/ibm/ecdump}} (medium speed)<br />
<br />
{{cmdroot|echo 0x2F 0x07 > /proc/acpi/ibm/ecdump}} (maximum speed)<br />
<br />
{{cmdroot|echo 0x2F 0x80 > /proc/acpi/ibm/ecdump}} (automatic - default)<br />
<br />
{{cmdroot|echo 0x2F 0x40 > /proc/acpi/ibm/ecdump}} (disengaged)<br />
<br />
See the specifications below for the meaning of these modes.<br />
<br />
===On/off control using stock kernel===<br />
<br />
If you only wish to turn the fan on and off (with automatic control when it's on), you can use the following.<br />
<br />
When loading [[ibm-acpi]] v0.11 with experimental switch ({{cmdroot|1=modprobe ibm_acpi experimental=1}}), it is possible to read and write the status of fan:<br />
<br />
'''#cat /proc/acpi/ibm/fan'''<br />
status: enabled<br />
speed: 3580<br />
commands: enable, disable<br />
<br />
'''#echo disable > /proc/acpi/ibm/fan'''<br />
<br />
'''cat /proc/acpi/ibm/fan'''<br />
status: disabled<br />
speed: 0<br />
commands: enable, disable<br />
<br />
When off, the fan will then '''never''' wake up. It is advised to use an automated control script to reduce the chance of hardware damage.<br />
<br />
===Automated control scripts===<br />
<br />
An [[ACPI fan control script#Variable speed control scripts|ACPI fan control script]] can be to override the firmware's fan algorithm with gentler, quieter version. It monitors the laptop's [[thermal sensors]] and sets the fan speed accordingly, according to customizable thresholds. For the default behavior, simply save the [[ACPI fan control script#Variable speed control scripts|script]] as {{path|tp-fancontrol}} and run<br /><br />
{{cmdroot|./tp-fancontrol}}<br />
<br />
==For Windows==<br />
<br />
Shimodax's ThinkPad fan control tool offers similar functionality (see [http://forum.thinkpads.com/viewtopic.php?t=17715 forum discussion] at thinkpads.com). Source and binaries are available through the [http://sourceforge.net/projects/tp4xfancontrol "Tp4xFanControl"] project on SourceForge.<br />
<br />
==Hardware specs==<br />
<br />
The following hardware behavior was discovered experimentally by [[User:Thinker|Thinker]] and neither provided by nor confirmed by IBM/Lenovo. The following description may be inaccurate and may vary by model (see list of models above). The terminology probably does not match the one used by IBM/Lenovo engineers.<br />
<br />
ACPI DSDT register _SB.PCI0.LPC.EC.HFSP (8 bits, offset 0x2F in the <tt>EmbeddedController</tt> address space, accessed through the standard EC interface at IO ports 0x62 and 0x66) is read/writable and has the following meaning:<br />
<br />
Bits 7 6 5 4 3 2 1 0<br />
---------------<br />
Value 1 0 * * * * * * - automatic<br />
* 1 * * * * * * - disengaged<br />
0 0 N N N N N N - manual (0..63; 0=disable fan, 1=min, ..., 7=max)<br />
<br />
In ''automatic'' mode, the embedded controller sets the fan speed automatically according to system temperatures and some unknown algorithm.<br />
<br />
In ''manual'' mode, the fan level is forced to the given value and the EC will auto-regulate the fan to maintain at a (roughly) constant RPM, which is model-dependent. Manual speed levels 8-63 yield the same behavior as level 7, and the the ACPI DSDT uses level 7 for the emergency mode it enters upon critical CPU/GPU temperature, so apparently 7 is the real maximum level.<br />
<br />
In ''disengaged'' mode, the embedded controller does not read the fan RPM (hence <tt>EmbeddedController</tt> offset 0x84 is not updated), and does not maintain a stable fan speed. When disengaged mode is entered the fan speed is not immediately changed (except if the fan was disabed, in which case it is turned on at a low level). However, once in disengaged mode, fan speed will slowly increase to ''beyond'' the maximum manual level (this may cause hardware damage!).<br />
<br />
{{NOTE|The "disengaged" mode has a different behaviour on ThinkPad {{A31}} than that described above. As above, the fan speed increases beyond the levels of the regular 0-7 speed settings. However, the speed increase is fairly instantaneous (the change being as fast as the transition between any other two speed levels, except 0 (off) which seems faster, i.e. immediate); and the fan speed reading is ''continuously'' available while in "disengaged" mode. In the {{A31}}, the speed reaches about 4000 RPM as listed in the table below.}}<br />
<br />
After boot, the HFSP register may not reflect the true state of the EC (on some models it reads 0x07 even though the EC is actually in automatic mode).<br />
<br />
{{HINT|Apparently the [[Problem with fan noise|pulsing fan noise]] experienced by some users can be cured by repeatedly running 2-4 seconds of manual control followed by 0.5-1 seconds of disengaged mode. The pulse occurs when the the embedded controller computes the fan speed and adjusts the fan voltage adaptively every few seconds (~4.8sec for the ThinkPad T43); the aforementioned mode switching doesn't give it a chance to do so. One of the [[ACPI fan control script#Variable speed control scripts|ACPI fan control scripts]] implements this solution.}}<br />
<br />
==Supported models==<br />
<br />
The above was successfully tested on the following models:<br />
<br />
* ThinkPad {{T43}}, {{T43p}} (fan levels RPM: 1-2 = ~3300, 3-5 = ~4100, 6-7 = ~4700; disengaged mode works)<br />
* ThinkPad {{T42}}, {{T42p}} (fan levels RPM: 1-2 = ~2900, 3-5 = ~3700, 6-7 = ~4700; disengaged mode works at ~5200)<br />
* ThinkPad {{T41}}, {{T41p}} (fan levels RPM: 1-2 = ~2980, 3-5 = ~3500, 6-7 = ~4050; disengaged mode works at ~5100)<br />
* ThinkPad {{T40}} (fan levels RPM: 1-2 = ~2950, 3-5 = ~3600, 6-7 = ~4050)<br />
* ThinkPad {{T30}}<br />
* ThinkPad {{T22}}<br />
* ThinkPad {{T23}} (low speed = ~2200, medium and maximum speed = ~4800; disengaged mode works at ~5800)<br />
* ThinkPad {{R52}}<br />
* ThinkPad {{R50}} (highest manual level is 3; disengage mode works and reaches much higher RPM)<br />
* ThinkPad {{R50p}} (disengaged mode works at ~5100)<br />
* ThinkPad {{R51}} (level 0 = off, level 1-2 = ~3150, level 3-5 = ~3350, level 6 = ~3750, disengaged = ~5100)<br />
* ThinkPad {{X30}} (level 0 = off, low = ~3900, medium = ~4200, maximum = ~4650, disengaged = ~5900)<br />
* ThinkPad {{X31}}<br />
* ThinkPad {{X40}}<br />
* ThinkPad {{X41T}}<br />
* ThinkPad {{Z60t}} (fan levels RPM: 1-2 = ~1700, 3-5 = ~2800, 6-7 = ~3500)<br />
* ThinkPad {{Z60m}} (fan levels like Z60t)<br />
* ThinkPad {{X60}}<br />
* ThinkPad {{A31}} (fan levels RPM: 0 = off, 1-2 = ~3280-3380 (!), 3-5 = ~3200, 6-7 = ~3380, "disengaged" = ~4000 (see NOTE above))<br />
Probably other models are supported too (please update this page if you confirm this).<br />
<br />
==Models using a different interface==<br />
<br />
The following models also work, use a different access method which supported (only) via the {{path|/proc/acpi/ibm/fan}} of [[ibm-acpi]]. No need for patching.<br />
<br />
* ThinkPad {{600E}}, {{600X}}, {{770E}}, {{770X}} (these use a different fan control interface)<br />
<br />
==Unsupported models==<br />
<br />
* ThinkPad {{560}} (these models don't have a fan)</div>Miloshttps://www.thinkwiki.org/w/index.php?title=Thermal_Sensors&diff=25329Thermal Sensors2006-10-18T09:03:02Z<p>Milos: Added link to forum thread where A31 sensor location data is reported</p>
<hr />
<div>{| width="100%"<br />
|style="vertical-align:top;padding-right:20px;width:10px;white-space:nowrap;" | __TOC__<br />
|style="vertical-align:top" |<br />
This page summarizes known information about the locations and properties of thermal sensors on ThinkPad laptops. <br />
|}<br />
==Accessing the sensors==<br />
===Basic ACPI system temperature sensors===<br />
The primary means of accessing the thermal sensors is through the [[ibm-acpi]] module. When the module is loaded, the first 8 sensors (some of which may be inactive) are shown in {{path|/proc/acpi/ibm/thermal}}:<br />
<br />
:{{cmdroot|cat /proc/acpi/ibm/thermal}}<br />
:{{cmdresult|temperatures: 44 41 33 42 33 -128 30 -128}}<br />
<br />
A value of -128 (i.e., 0x80 hex) means the sensor is not connected. For example, above the two -128 values belong to the UltraBay battery, which is not plugged in.<br />
<br />
===Extra ACPI system temperature sensors===<br />
<br />
On recent ThinkPad models, three extra sensors are accessible through ACPI at Embedded Controller offsets 0xC0 to 0xC2. There are two ways to access them:<br />
<br />
====Accessing the extra ACPI sensors through <tt>ecdump</tt>====<br />
<br />
Load [[ibm-acpi]] with the <tt>experimental=1</tt> option, and parse {{path|/proc/acpi/ibm/ecdump}}:<br />
:{{cmdroot|perl -ne 'm/^EC 0xc0: .(..) .(..) .(..) / or next; print hex($1)." ".hex($2)." ".hex($3)."\n"' < /proc/acpi/ibm/ecdump}}<br />
:{{cmdresult|40 48 43}}<br />
<br />
Future models might provide additional extra sensors beyond those three. To see all candidates:<br />
:{{cmdroot|perl -ne 'print join(" ",map(hex,m/\w+/g))."\n" if s/^EC 0xc0://' < /proc/acpi/ibm/ecdump}}<br />
:{{cmdresult|40 48 43 128 128 128 128 128 0 0 0 0 0 0 0 0}}<br />
<br />
====Patch for accessing the extra ACPI sensors through <tt>thermal</tt>====<br />
<br />
To make the extra 3 sensors show up on {{path|/proc/acpi/ibm/thermal}} just like the 8 basic sensors, apply the {{CodeRef|ibm_acpi-extra-thermal.patch}} kernel patch to [[ibm-acpi]].<br />
<br />
Then:<br />
<br />
:{{cmdroot|cat /proc/acpi/ibm/thermal}}<br />
:{{cmdresult|temperatures: 44 41 33 42 33 -128 30 -128 40 48 43}}<br />
<br />
If you apply this patch in conjunction with [[ACPI_fan_control_script#Comprehensive_bash_script_with_fine_control_over_fan_speed|tp-fancontrol]], you'll need tp-fancontrol 0.2.9 or newer.<br />
<br />
===HDAPS temperature sensor===<br />
The [[Active Protection System]] accelerometer also reports a temperature, which is identical to one of the ACPI sensors. The corresponding sensor is actually not inside the HDAPS chip, but fairly close.<br />
:{{cmdroot|cat /sys/bus/platform/drivers/hdaps/hdaps/temp1}}<br />
:{{cmdresult|41}}<br />
<br />
===Harddisks SMART temperature sensor===<br />
Finally, the system hard disk temperature can be read through the disk's SMART interface:<br />
:{{cmdroot|<nowiki>smartctl -A /dev/hda | grep Temperature</nowiki>}}<br />
:{{cmdresult|194 Temperature_Celsius 0x0022 145 097 000 Old_age Always - 31}}<br />
<br />
Or, for SATA-equipped models running a recent Linux kernel (see [[Problems with SATA and Linux]]):<br />
<br />
:{{cmdroot|<nowiki>smartctl -A -d ata /dev/sda | grep Temperature</nowiki>}}<br />
:{{cmdresult|194 Temperature_Celsius 0x0022 145 097 000 Old_age Always - 31}}<br />
<br />
When the [[UltraBay Slim HDD Adapter]] or [[UltraBay Slim SATA HDD Adapter]] are used, the second hard disk will typically provide another temperature readout via its SMART interface, analogously to the above.<br />
<br />
==Utilities for viewing temperatures==<br />
<br />
The following utilities display the ThinkPad-specific thermal sensor readouts:<br />
* The above shell commands.<br />
* The "Sensors" builtin of [[GKrellM]] can show 6 specific ACPI sensors (out of up to 11).<br />
* [http://www.kde-look.org/content/show.php?content=33257 CPU Info] is a KDE applet that can display the 8 first ACPI sensors as well as the HDAPS sensor.<br />
* [http://www.kraus.tk/projects/IBMDoK/ IBMDoK], another KDE applet. Shows 4 specific sensors (out of up to 11). So far only tested at the {{T60}}.<br />
* [http://www.zolnott.de/software/applications/ibm-acpi-applet-for-gnome-210-and-higher.html IBM ACPI applet] is a small gnome panel applet which shows the fan speed and thermal informations.<br />
* There is an [http://munin.projects.linpro.no/wiki/plugin-ibm_acpi ibm_acpi plugin] for [http://munin.projects.linpro.no/ Munin].<br />
* [http://sensors-applet.sourceforge.net/ GNOME Sensors Applet] supports ibm_acpi.<br />
<br />
==Sensor locations==<br />
This information is model specific.<br />
<br />
===ThinkPad {{R51}}===<br />
The [[ibm-acpi]] documentation includes the report by Thomas Gruber:<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 Mini-PCI<br />
0x7A 3 HDD<br />
0x7B 4 GPU<br />
0x7C 5 System battery<br />
0x7D 6 UltraBay battery<br />
0x7E 7 System battery<br />
0x7F 8 UltraBay battery<br />
0xC0 none ?<br />
0xC1 none ?<br />
0xC2 none ?<br />
<br />
===ThinkPad {{T40}}===<br />
The location of one of the sensors is identified [http://forum.thinkpads.com/viewtopic.php?t=11574 here].<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 System board under rear left corner of Mini-PCI module<br />
0x7A 3 ?<br />
0x7B 4 GPU<br />
0x7C 5 Battery<br />
0x7D 6 n/a<br />
0x7E 7 Battery<br />
0x7F 8 n/a<br />
0xC0 none n/a<br />
0xC1 none n/a<br />
0xC2 none n/a<br />
<br />
===ThinkPad {{T43}}, {{T43p}}===<br />
Found by Shmidoax using cooling spray to cool down components and observe the effect on the sensors.<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 Between PCMCIA slot and CPU (same as HDAPS module)<br />
0x7A 3 PCMCIA slot<br />
0x7B 4 GPU<br />
0x7C 5 System battery (front left = charging circuit)<br />
0x7D 6 UltraBay battery?<br />
0x7E 7 System battery (rear right)<br />
0x7F 8 UltraBay battery?<br />
0xC0 none Bus between Northbridge and DRAM<br />
0xC1 none Southbridge (under Mini-PCI card, under touchpad)<br />
0xC2 none Power circuitry, on underside of system board under F2 key<br />
{{gallery_start}}<br />
{{thumb|T43-thermal-sensors.jpg|ThinkPad T43 sensor locations}}<br />
{{thumb|T43-2668-thermal-sensors-zoom.jpg|ThinkPad T43 sensor locations detail}}<br />
{{thumb|T43p-H8S2161.jpg|ThinkPad T43/p 26xx Embedded Controller Renesas H8S/2161BV}}<br />
{{gallery_end}}<br />
<br />
===ThinkPad {{T60}}===<br />
Found by Marco Kraus for use in [http://www.kraus.tk/projects/IBMDoK/ IBMDok].<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU 0<br />
0x79 2 HDD<br />
0x7A 3 HDD<br />
0x7B 4 GPU<br />
0x7C 5 Battery<br />
0x7D 6 n/a<br />
0x7E 7 Battery<br />
0x7F 8 n/a<br />
0xC0 none ?<br />
0xC1 none ?<br />
0xC2 none ?<br />
<br />
The CPU thermal sensors seem to be exposed in both {{path|/proc/acpi/thermal_zone/THM0/temperature}} and {{path|/proc/acpi/thermal_zone/THM1/temperature}}, though the latter curiously seems to exist only in this file and nowhere in {{path|/proc/acpi/ibm/ecdump}}.<br />
<br />
===ThinkPad {{A31}}===<br />
Found by Milos Popovic using cooling spray to cool down components on a completely removed, running motherboard, to locate the sensors. Also reported [http://forum.thinkpads.com/viewtopic.php?t=31837 here].<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 Battery (this one heats up when on battery power)<br />
0x7A 3 Power (sensor near power diodes and CPU; heats up when high power consumption, has crosstalk from CPU)<br />
0x7B 4 Ultrabay 2000 battery?<br />
0x7C 5 Northbridge (sensor next to Northbridge, also somewhat near GPU)<br />
0x7D 6 PCMCIA/ambient (sensor is a National Semiconductor LM75 Digital Temperature Sensor/Thermal Watchdog chip<br />
next to the 9-pin VGA connector; sits right under PCMCIA slots but doesn't touch)<br />
0x7E 7 Battery (this one stays near ambient temperature, even when on battery power)<br />
0x7F 8 Ultrabay 2000 battery?<br />
0xC0 none zero<br />
0xC1 none zero<br />
0xC2 none zero<br />
The following photos (resolution reduced for server space) show the locations found for the listed temperature sensors.<br />
{{gallery_start}}<br />
{{thumb|A31_2652M3U_systemboardtop_DSCN6105_tempsensors_lores.jpg|ThinkPad A31 sensor locations on top of motherboard.}}<br />
{{thumb|A31_2652M3U_systemboardbottom_DSCN6105_tempsensors_lores.jpg|ThinkPad A31 sensor locations on bottom of motherboard.}}<br />
{{gallery_end}}<br />
On this A31 systemboard (FRU 26P8398), there is a [http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2313 Maxim MAX1668] 5-channel remote/local temperature sensor (4 remote + 1 self temperature) on top of the systemboard, and a [http://www.national.com/pf/LM/LM75.html National Semiconductor LM75] single-channel "digital temperature sensor and thermal watchdog" chip. It would appear that the LM75 has the ability to hard shutdown the processor (without software intervention) if its temperature exceeds a given threshold. I'm not sure if it is wired for this, nor whether the Thinkpad changes the threshold temperature from the chip's power-up default of 80°C. A software application with drivers on the LM75 webpage is available that claims to allow direct access to the thermal sensor chip (this hasn't been tried, but could be useful in other models to determine if this sensor is somewhere on the MB, and which register it corresponds to). The MAX1668's self-temperature reading does not appear anywhere in the above temperature registers; it's not clear whether it is read at all, and whether it is to be found elsewhere in the EC memory. These two chips (LM75 and MAX1668) account for some of the sensors.</div>Miloshttps://www.thinkwiki.org/w/index.php?title=Thermal_Sensors&diff=25286Thermal Sensors2006-10-15T20:24:00Z<p>Milos: Added a bit of info re: LM75 and MAX1668 temp sensors on A31 motherboard</p>
<hr />
<div>{| width="100%"<br />
|style="vertical-align:top;padding-right:20px;width:10px;white-space:nowrap;" | __TOC__<br />
|style="vertical-align:top" |<br />
This page summarizes known information about the locations and properties of thermal sensors on ThinkPad laptops. <br />
|}<br />
==Accessing the sensors==<br />
===Basic ACPI system temperature sensors===<br />
The primary means of accessing the thermal sensors is through the [[ibm-acpi]] module. When the module is loaded, the first 8 sensors (some of which may be inactive) are shown in {{path|/proc/acpi/ibm/thermal}}:<br />
<br />
:{{cmdroot|cat /proc/acpi/ibm/thermal}}<br />
:{{cmdresult|temperatures: 44 41 33 42 33 -128 30 -128}}<br />
<br />
A value of -128 (i.e., 0x80 hex) means the sensor is not connected. For example, above the two -128 values belong to the UltraBay battery, which is not plugged in.<br />
<br />
===Extra ACPI system temperature sensors===<br />
<br />
On recent ThinkPad models, three extra sensors are accessible through ACPI at Embedded Controller offsets 0xC0 to 0xC2. There are two ways to access them:<br />
<br />
====Accessing the extra ACPI sensors through <tt>ecdump</tt>====<br />
<br />
Load [[ibm-acpi]] with the <tt>experimental=1</tt> option, and parse {{path|/proc/acpi/ibm/ecdump}}:<br />
:{{cmdroot|perl -ne 'm/^EC 0xc0: .(..) .(..) .(..) / or next; print hex($1)." ".hex($2)." ".hex($3)."\n"' < /proc/acpi/ibm/ecdump}}<br />
:{{cmdresult|40 48 43}}<br />
<br />
Future models might provide additional extra sensors beyond those three. To see all candidates:<br />
:{{cmdroot|perl -ne 'print join(" ",map(hex,m/\w+/g))."\n" if s/^EC 0xc0://' < /proc/acpi/ibm/ecdump}}<br />
:{{cmdresult|40 48 43 128 128 128 128 128 0 0 0 0 0 0 0 0}}<br />
<br />
====Patch for accessing the extra ACPI sensors through <tt>thermal</tt>====<br />
<br />
To make the extra 3 sensors show up on {{path|/proc/acpi/ibm/thermal}} just like the 8 basic sensors, apply the {{CodeRef|ibm_acpi-extra-thermal.patch}} kernel patch to [[ibm-acpi]].<br />
<br />
Then:<br />
<br />
:{{cmdroot|cat /proc/acpi/ibm/thermal}}<br />
:{{cmdresult|temperatures: 44 41 33 42 33 -128 30 -128 40 48 43}}<br />
<br />
If you apply this patch in conjunction with [[ACPI_fan_control_script#Comprehensive_bash_script_with_fine_control_over_fan_speed|tp-fancontrol]], you'll need tp-fancontrol 0.2.9 or newer.<br />
<br />
===HDAPS temperature sensor===<br />
The [[Active Protection System]] accelerometer also reports a temperature, which is identical to one of the ACPI sensors. The corresponding sensor is actually not inside the HDAPS chip, but fairly close.<br />
:{{cmdroot|cat /sys/bus/platform/drivers/hdaps/hdaps/temp1}}<br />
:{{cmdresult|41}}<br />
<br />
===Harddisks SMART temperature sensor===<br />
Finally, the system hard disk temperature can be read through the disk's SMART interface:<br />
:{{cmdroot|<nowiki>smartctl -A /dev/hda | grep Temperature</nowiki>}}<br />
:{{cmdresult|194 Temperature_Celsius 0x0022 145 097 000 Old_age Always - 31}}<br />
<br />
Or, for SATA-equipped models running a recent Linux kernel (see [[Problems with SATA and Linux]]):<br />
<br />
:{{cmdroot|<nowiki>smartctl -A -d ata /dev/sda | grep Temperature</nowiki>}}<br />
:{{cmdresult|194 Temperature_Celsius 0x0022 145 097 000 Old_age Always - 31}}<br />
<br />
When the [[UltraBay Slim HDD Adapter]] or [[UltraBay Slim SATA HDD Adapter]] are used, the second hard disk will typically provide another temperature readout via its SMART interface, analogously to the above.<br />
<br />
==Utilities for viewing temperatures==<br />
<br />
The following utilities display the ThinkPad-specific thermal sensor readouts:<br />
* The above shell commands.<br />
* The "Sensors" builtin of [[GKrellM]] can show 6 specific ACPI sensors (out of up to 11).<br />
* [http://www.kde-look.org/content/show.php?content=33257 CPU Info] is a KDE applet that can display the 8 first ACPI sensors as well as the HDAPS sensor.<br />
* [http://www.kraus.tk/projects/IBMDoK/ IBMDoK], another KDE applet. Shows 4 specific sensors (out of up to 11). So far only tested at the {{T60}}.<br />
* [http://www.zolnott.de/software/applications/ibm-acpi-applet-for-gnome-210-and-higher.html IBM ACPI applet] is a small gnome panel applet which shows the fan speed and thermal informations.<br />
* There is an [http://munin.projects.linpro.no/wiki/plugin-ibm_acpi ibm_acpi plugin] for [http://munin.projects.linpro.no/ Munin].<br />
* [http://sensors-applet.sourceforge.net/ GNOME Sensors Applet] supports ibm_acpi.<br />
<br />
==Sensor locations==<br />
This information is model specific.<br />
<br />
===ThinkPad {{R51}}===<br />
The [[ibm-acpi]] documentation includes the report by Thomas Gruber:<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 Mini-PCI<br />
0x7A 3 HDD<br />
0x7B 4 GPU<br />
0x7C 5 System battery<br />
0x7D 6 UltraBay battery<br />
0x7E 7 System battery<br />
0x7F 8 UltraBay battery<br />
0xC0 none ?<br />
0xC1 none ?<br />
0xC2 none ?<br />
<br />
===ThinkPad {{T40}}===<br />
The location of one of the sensors is identified [http://forum.thinkpads.com/viewtopic.php?t=11574 here].<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 System board under rear left corner of Mini-PCI module<br />
0x7A 3 ?<br />
0x7B 4 GPU<br />
0x7C 5 Battery<br />
0x7D 6 n/a<br />
0x7E 7 Battery<br />
0x7F 8 n/a<br />
0xC0 none n/a<br />
0xC1 none n/a<br />
0xC2 none n/a<br />
<br />
===ThinkPad {{T43}}, {{T43p}}===<br />
Found by Shmidoax using cooling spray to cool down components and observe the effect on the sensors.<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 Between PCMCIA slot and CPU (same as HDAPS module)<br />
0x7A 3 PCMCIA slot<br />
0x7B 4 GPU<br />
0x7C 5 System battery (front left = charging circuit)<br />
0x7D 6 UltraBay battery?<br />
0x7E 7 System battery (rear right)<br />
0x7F 8 UltraBay battery?<br />
0xC0 none Bus between Northbridge and DRAM<br />
0xC1 none Southbridge (under Mini-PCI card, under touchpad)<br />
0xC2 none Power circuitry, on underside of system board under F2 key<br />
{{gallery_start}}<br />
{{thumb|T43-thermal-sensors.jpg|ThinkPad T43 sensor locations}}<br />
{{thumb|T43-2668-thermal-sensors-zoom.jpg|ThinkPad T43 sensor locations detail}}<br />
{{thumb|T43p-H8S2161.jpg|ThinkPad T43/p 26xx Embedded Controller Renesas H8S/2161BV}}<br />
{{gallery_end}}<br />
<br />
===ThinkPad {{T60}}===<br />
Found by Marco Kraus for use in [http://www.kraus.tk/projects/IBMDoK/ IBMDok].<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU 0<br />
0x79 2 HDD<br />
0x7A 3 HDD<br />
0x7B 4 GPU<br />
0x7C 5 Battery<br />
0x7D 6 n/a<br />
0x7E 7 Battery<br />
0x7F 8 n/a<br />
0xC0 none ?<br />
0xC1 none ?<br />
0xC2 none ?<br />
<br />
The CPU thermal sensors seem to be exposed in both {{path|/proc/acpi/thermal_zone/THM0/temperature}} and {{path|/proc/acpi/thermal_zone/THM1/temperature}}, though the latter curiously seems to exist only in this file and nowhere in {{path|/proc/acpi/ibm/ecdump}}.<br />
<br />
===ThinkPad {{A31}}===<br />
Found by Milos Popovic using cooling spray to cool down components on a completely removed, running motherboard, to locate the sensors.<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 Battery (this one heats up when on battery power)<br />
0x7A 3 Power (sensor near power diodes and CPU; heats up when high power consumption, has crosstalk from CPU)<br />
0x7B 4 Ultrabay 2000 battery?<br />
0x7C 5 Northbridge (sensor next to Northbridge, also somewhat near GPU)<br />
0x7D 6 PCMCIA/ambient (sensor is a National Semiconductor LM75 Digital Temperature Sensor/Thermal Watchdog chip<br />
next to the 9-pin VGA connector; sits right under PCMCIA slots but doesn't touch)<br />
0x7E 7 Battery (this one stays near ambient temperature, even when on battery power)<br />
0x7F 8 Ultrabay 2000 battery?<br />
0xC0 none zero<br />
0xC1 none zero<br />
0xC2 none zero<br />
The following photos (resolution reduced for server space) show the locations found for the listed temperature sensors.<br />
{{gallery_start}}<br />
{{thumb|A31_2652M3U_systemboardtop_DSCN6105_tempsensors_lores.jpg|ThinkPad A31 sensor locations on top of motherboard.}}<br />
{{thumb|A31_2652M3U_systemboardbottom_DSCN6105_tempsensors_lores.jpg|ThinkPad A31 sensor locations on bottom of motherboard.}}<br />
{{gallery_end}}<br />
On this A31 systemboard (FRU 26P8398), there is a [http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2313 Maxim MAX1668] 5-channel remote/local temperature sensor (4 remote + 1 self temperature) on top of the systemboard, and a [http://www.national.com/pf/LM/LM75.html National Semiconductor LM75] single-channel "digital temperature sensor and thermal watchdog" chip. It would appear that the LM75 has the ability to hard shutdown the processor (without software intervention) if its temperature exceeds a given threshold. I'm not sure if it is wired for this, nor whether the Thinkpad changes the threshold temperature from the chip's power-up default of 80°C. A software application with drivers on the LM75 webpage is available that claims to allow direct access to the thermal sensor chip (this hasn't been tried, but could be useful in other models to determine if this sensor is somewhere on the MB, and which register it corresponds to). The MAX1668's self-temperature reading does not appear anywhere in the above temperature registers; it's not clear whether it is read at all, and whether it is to be found elsewhere in the EC memory. These two chips (LM75 and MAX1668) account for some of the sensors.</div>Miloshttps://www.thinkwiki.org/w/index.php?title=Thermal_Sensors&diff=25273Thermal Sensors2006-10-15T08:07:48Z<p>Milos: Added photos showing temperature sensor locations on Thinkpad A31</p>
<hr />
<div>{| width="100%"<br />
|style="vertical-align:top;padding-right:20px;width:10px;white-space:nowrap;" | __TOC__<br />
|style="vertical-align:top" |<br />
This page summarizes known information about the locations and properties of thermal sensors on ThinkPad laptops. <br />
|}<br />
==Accessing the sensors==<br />
===Basic ACPI system temperature sensors===<br />
The primary means of accessing the thermal sensors is through the [[ibm-acpi]] module. When the module is loaded, the first 8 sensors (some of which may be inactive) are shown in {{path|/proc/acpi/ibm/thermal}}:<br />
<br />
:{{cmdroot|cat /proc/acpi/ibm/thermal}}<br />
:{{cmdresult|temperatures: 44 41 33 42 33 -128 30 -128}}<br />
<br />
A value of -128 (i.e., 0x80 hex) means the sensor is not connected. For example, above the two -128 values belong to the UltraBay battery, which is not plugged in.<br />
<br />
===Extra ACPI system temperature sensors===<br />
<br />
On recent ThinkPad models, three extra sensors are accessible through ACPI at Embedded Controller offsets 0xC0 to 0xC2. There are two ways to access them:<br />
<br />
====Accessing the extra ACPI sensors through <tt>ecdump</tt>====<br />
<br />
Load [[ibm-acpi]] with the <tt>experimental=1</tt> option, and parse {{path|/proc/acpi/ibm/ecdump}}:<br />
:{{cmdroot|perl -ne 'm/^EC 0xc0: .(..) .(..) .(..) / or next; print hex($1)." ".hex($2)." ".hex($3)."\n"' < /proc/acpi/ibm/ecdump}}<br />
:{{cmdresult|40 48 43}}<br />
<br />
Future models might provide additional extra sensors beyond those three. To see all candidates:<br />
:{{cmdroot|perl -ne 'print join(" ",map(hex,m/\w+/g))."\n" if s/^EC 0xc0://' < /proc/acpi/ibm/ecdump}}<br />
:{{cmdresult|40 48 43 128 128 128 128 128 0 0 0 0 0 0 0 0}}<br />
<br />
====Patch for accessing the extra ACPI sensors through <tt>thermal</tt>====<br />
<br />
To make the extra 3 sensors show up on {{path|/proc/acpi/ibm/thermal}} just like the 8 basic sensors, apply the {{CodeRef|ibm_acpi-extra-thermal.patch}} kernel patch to [[ibm-acpi]].<br />
<br />
Then:<br />
<br />
:{{cmdroot|cat /proc/acpi/ibm/thermal}}<br />
:{{cmdresult|temperatures: 44 41 33 42 33 -128 30 -128 40 48 43}}<br />
<br />
If you apply this patch in conjunction with [[ACPI_fan_control_script#Comprehensive_bash_script_with_fine_control_over_fan_speed|tp-fancontrol]], you'll need tp-fancontrol 0.2.9 or newer.<br />
<br />
===HDAPS temperature sensor===<br />
The [[Active Protection System]] accelerometer also reports a temperature, which is identical to one of the ACPI sensors. The corresponding sensor is actually not inside the HDAPS chip, but fairly close.<br />
:{{cmdroot|cat /sys/bus/platform/drivers/hdaps/hdaps/temp1}}<br />
:{{cmdresult|41}}<br />
<br />
===Harddisks SMART temperature sensor===<br />
Finally, the system hard disk temperature can be read through the disk's SMART interface:<br />
:{{cmdroot|<nowiki>smartctl -A /dev/hda | grep Temperature</nowiki>}}<br />
:{{cmdresult|194 Temperature_Celsius 0x0022 145 097 000 Old_age Always - 31}}<br />
<br />
Or, for SATA-equipped models running a recent Linux kernel (see [[Problems with SATA and Linux]]):<br />
<br />
:{{cmdroot|<nowiki>smartctl -A -d ata /dev/sda | grep Temperature</nowiki>}}<br />
:{{cmdresult|194 Temperature_Celsius 0x0022 145 097 000 Old_age Always - 31}}<br />
<br />
When the [[UltraBay Slim HDD Adapter]] or [[UltraBay Slim SATA HDD Adapter]] are used, the second hard disk will typically provide another temperature readout via its SMART interface, analogously to the above.<br />
<br />
==Utilities for viewing temperatures==<br />
<br />
The following utilities display the ThinkPad-specific thermal sensor readouts:<br />
* The above shell commands.<br />
* The "Sensors" builtin of [[GKrellM]] can show 6 specific ACPI sensors (out of up to 11).<br />
* [http://www.kde-look.org/content/show.php?content=33257 CPU Info] is a KDE applet that can display the 8 first ACPI sensors as well as the HDAPS sensor.<br />
* [http://www.kraus.tk/projects/IBMDoK/ IBMDoK], another KDE applet. Shows 4 specific sensors (out of up to 11). So far only tested at the {{T60}}.<br />
* [http://www.zolnott.de/software/applications/ibm-acpi-applet-for-gnome-210-and-higher.html IBM ACPI applet] is a small gnome panel applet which shows the fan speed and thermal informations.<br />
* There is an [http://munin.projects.linpro.no/wiki/plugin-ibm_acpi ibm_acpi plugin] for [http://munin.projects.linpro.no/ Munin].<br />
* [http://sensors-applet.sourceforge.net/ GNOME Sensors Applet] supports ibm_acpi.<br />
<br />
==Sensor locations==<br />
This information is model specific.<br />
<br />
===ThinkPad {{R51}}===<br />
The [[ibm-acpi]] documentation includes the report by Thomas Gruber:<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 Mini-PCI<br />
0x7A 3 HDD<br />
0x7B 4 GPU<br />
0x7C 5 System battery<br />
0x7D 6 UltraBay battery<br />
0x7E 7 System battery<br />
0x7F 8 UltraBay battery<br />
0xC0 none ?<br />
0xC1 none ?<br />
0xC2 none ?<br />
<br />
===ThinkPad {{T40}}===<br />
The location of one of the sensors is identified [http://forum.thinkpads.com/viewtopic.php?t=11574 here].<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 System board under rear left corner of Mini-PCI module<br />
0x7A 3 ?<br />
0x7B 4 GPU<br />
0x7C 5 Battery<br />
0x7D 6 n/a<br />
0x7E 7 Battery<br />
0x7F 8 n/a<br />
0xC0 none n/a<br />
0xC1 none n/a<br />
0xC2 none n/a<br />
<br />
===ThinkPad {{T43}}, {{T43p}}===<br />
Found by Shmidoax using cooling spray to cool down components and observe the effect on the sensors.<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 Between PCMCIA slot and CPU (same as HDAPS module)<br />
0x7A 3 PCMCIA slot<br />
0x7B 4 GPU<br />
0x7C 5 System battery (front left = charging circuit)<br />
0x7D 6 UltraBay battery?<br />
0x7E 7 System battery (rear right)<br />
0x7F 8 UltraBay battery?<br />
0xC0 none Bus between Northbridge and DRAM<br />
0xC1 none Southbridge (under Mini-PCI card, under touchpad)<br />
0xC2 none Power circuitry, on underside of system board under F2 key<br />
{{gallery_start}}<br />
{{thumb|T43-thermal-sensors.jpg|ThinkPad T43 sensor locations}}<br />
{{thumb|T43-2668-thermal-sensors-zoom.jpg|ThinkPad T43 sensor locations detail}}<br />
{{thumb|T43p-H8S2161.jpg|ThinkPad T43/p 26xx Embedded Controller Renesas H8S/2161BV}}<br />
{{gallery_end}}<br />
<br />
===ThinkPad {{T60}}===<br />
Found by Marco Kraus for use in [http://www.kraus.tk/projects/IBMDoK/ IBMDok].<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU 0<br />
0x79 2 HDD<br />
0x7A 3 HDD<br />
0x7B 4 GPU<br />
0x7C 5 Battery<br />
0x7D 6 n/a<br />
0x7E 7 Battery<br />
0x7F 8 n/a<br />
0xC0 none ?<br />
0xC1 none ?<br />
0xC2 none ?<br />
<br />
The CPU thermal sensors seem to be exposed in both {{path|/proc/acpi/thermal_zone/THM0/temperature}} and {{path|/proc/acpi/thermal_zone/THM1/temperature}}, though the latter curiously seems to exist only in this file and nowhere in {{path|/proc/acpi/ibm/ecdump}}.<br />
<br />
===ThinkPad {{A31}}===<br />
Found by Milos Popovic using cooling spray to cool down components on a completely removed, running motherboard, to locate the sensors.<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 Battery (this one heats up when on battery power)<br />
0x7A 3 Power (sensor near power diodes and CPU; heats up when high power consumption, has crosstalk from CPU)<br />
0x7B 4 Ultrabay 2000 battery?<br />
0x7C 5 Northbridge (sensor next to Northbridge, also somewhat near GPU)<br />
0x7D 6 PCMCIA/ambient (sensor is a National Semiconductor LM75 Digital Temperature Sensor/Thermal Watchdog chip<br />
next to the 9-pin VGA connector; sits right under PCMCIA slots but doesn't touch)<br />
0x7E 7 Battery (this one stays near ambient temperature, even when on battery power)<br />
0x7F 8 Ultrabay 2000 battery?<br />
0xC0 none zero<br />
0xC1 none zero<br />
0xC2 none zero<br />
The following photos (resolution reduced for server space) show the locations found for the listed temperature sensors. On this A31 systemboard (FRU 26P8398), there is a [http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2313 Maxim MAX1668] 5-channel remote/local temperature sensor (4 remote + 1 self temperature) on top of the systemboard, and a [http://www.national.com/pf/LM/LM75.html National Semiconductor LM75] single-channel "digital temperature sensor and thermal watchdog" chip. These account for some of the sensors.<br />
{{gallery_start}}<br />
{{thumb|A31_2652M3U_systemboardtop_DSCN6105_tempsensors_lores.jpg|ThinkPad A31 sensor locations on top of motherboard.}}<br />
{{thumb|A31_2652M3U_systemboardbottom_DSCN6105_tempsensors_lores.jpg|ThinkPad A31 sensor locations on bottom of motherboard.}}<br />
{{gallery_end}}</div>Miloshttps://www.thinkwiki.org/w/index.php?title=File:A31_2652M3U_systemboardbottom_DSCN6105_tempsensors_lores.jpg&diff=25272File:A31 2652M3U systemboardbottom DSCN6105 tempsensors lores.jpg2006-10-15T07:56:23Z<p>Milos: Bottom view of the systemboard (FRU 26P8938) of a Thinkpad A31 (model 2652-M3U), showing the locations of temperature sensors as determined by using cooling spray to locally cool the parts to find each sensor, while the system is running.</p>
<hr />
<div>Bottom view of the systemboard (FRU 26P8938) of a Thinkpad A31 (model 2652-M3U), showing the locations of temperature sensors as determined by using cooling spray to locally cool the parts to find each sensor, while the system is running.</div>Miloshttps://www.thinkwiki.org/w/index.php?title=File:A31_2652M3U_systemboardtop_DSCN6105_tempsensors_lores.jpg&diff=25271File:A31 2652M3U systemboardtop DSCN6105 tempsensors lores.jpg2006-10-15T07:52:50Z<p>Milos: Top view of the systemboard of a Thinkpad A31 (model 2652-M3U), showing the locations of temperature sensors as determined by using cooling spray to locally cool the parts to find each sensor, while the system is running.</p>
<hr />
<div>Top view of the systemboard of a Thinkpad A31 (model 2652-M3U), showing the locations of temperature sensors as determined by using cooling spray to locally cool the parts to find each sensor, while the system is running.</div>Miloshttps://www.thinkwiki.org/w/index.php?title=Thermal_Sensors&diff=25270Thermal Sensors2006-10-15T06:52:43Z<p>Milos: Added sensor positions for Thinkpad A31 obtained pretty exactly using cooling spray</p>
<hr />
<div>{| width="100%"<br />
|style="vertical-align:top;padding-right:20px;width:10px;white-space:nowrap;" | __TOC__<br />
|style="vertical-align:top" |<br />
This page summarizes known information about the locations and properties of thermal sensors on ThinkPad laptops. <br />
|}<br />
==Accessing the sensors==<br />
===Basic ACPI system temperature sensors===<br />
The primary means of accessing the thermal sensors is through the [[ibm-acpi]] module. When the module is loaded, the first 8 sensors (some of which may be inactive) are shown in {{path|/proc/acpi/ibm/thermal}}:<br />
<br />
:{{cmdroot|cat /proc/acpi/ibm/thermal}}<br />
:{{cmdresult|temperatures: 44 41 33 42 33 -128 30 -128}}<br />
<br />
A value of -128 (i.e., 0x80 hex) means the sensor is not connected. For example, above the two -128 values belong to the UltraBay battery, which is not plugged in.<br />
<br />
===Extra ACPI system temperature sensors===<br />
<br />
On recent ThinkPad models, three extra sensors are accessible through ACPI at Embedded Controller offsets 0xC0 to 0xC2. There are two ways to access them:<br />
<br />
====Accessing the extra ACPI sensors through <tt>ecdump</tt>====<br />
<br />
Load [[ibm-acpi]] with the <tt>experimental=1</tt> option, and parse {{path|/proc/acpi/ibm/ecdump}}:<br />
:{{cmdroot|perl -ne 'm/^EC 0xc0: .(..) .(..) .(..) / or next; print hex($1)." ".hex($2)." ".hex($3)."\n"' < /proc/acpi/ibm/ecdump}}<br />
:{{cmdresult|40 48 43}}<br />
<br />
Future models might provide additional extra sensors beyond those three. To see all candidates:<br />
:{{cmdroot|perl -ne 'print join(" ",map(hex,m/\w+/g))."\n" if s/^EC 0xc0://' < /proc/acpi/ibm/ecdump}}<br />
:{{cmdresult|40 48 43 128 128 128 128 128 0 0 0 0 0 0 0 0}}<br />
<br />
====Patch for accessing the extra ACPI sensors through <tt>thermal</tt>====<br />
<br />
To make the extra 3 sensors show up on {{path|/proc/acpi/ibm/thermal}} just like the 8 basic sensors, apply the {{CodeRef|ibm_acpi-extra-thermal.patch}} kernel patch to [[ibm-acpi]].<br />
<br />
Then:<br />
<br />
:{{cmdroot|cat /proc/acpi/ibm/thermal}}<br />
:{{cmdresult|temperatures: 44 41 33 42 33 -128 30 -128 40 48 43}}<br />
<br />
If you apply this patch in conjunction with [[ACPI_fan_control_script#Comprehensive_bash_script_with_fine_control_over_fan_speed|tp-fancontrol]], you'll need tp-fancontrol 0.2.9 or newer.<br />
<br />
===HDAPS temperature sensor===<br />
The [[Active Protection System]] accelerometer also reports a temperature, which is identical to one of the ACPI sensors. The corresponding sensor is actually not inside the HDAPS chip, but fairly close.<br />
:{{cmdroot|cat /sys/bus/platform/drivers/hdaps/hdaps/temp1}}<br />
:{{cmdresult|41}}<br />
<br />
===Harddisks SMART temperature sensor===<br />
Finally, the system hard disk temperature can be read through the disk's SMART interface:<br />
:{{cmdroot|<nowiki>smartctl -A /dev/hda | grep Temperature</nowiki>}}<br />
:{{cmdresult|194 Temperature_Celsius 0x0022 145 097 000 Old_age Always - 31}}<br />
<br />
Or, for SATA-equipped models running a recent Linux kernel (see [[Problems with SATA and Linux]]):<br />
<br />
:{{cmdroot|<nowiki>smartctl -A -d ata /dev/sda | grep Temperature</nowiki>}}<br />
:{{cmdresult|194 Temperature_Celsius 0x0022 145 097 000 Old_age Always - 31}}<br />
<br />
When the [[UltraBay Slim HDD Adapter]] or [[UltraBay Slim SATA HDD Adapter]] are used, the second hard disk will typically provide another temperature readout via its SMART interface, analogously to the above.<br />
<br />
==Utilities for viewing temperatures==<br />
<br />
The following utilities display the ThinkPad-specific thermal sensor readouts:<br />
* The above shell commands.<br />
* The "Sensors" builtin of [[GKrellM]] can show 6 specific ACPI sensors (out of up to 11).<br />
* [http://www.kde-look.org/content/show.php?content=33257 CPU Info] is a KDE applet that can display the 8 first ACPI sensors as well as the HDAPS sensor.<br />
* [http://www.kraus.tk/projects/IBMDoK/ IBMDoK], another KDE applet. Shows 4 specific sensors (out of up to 11). So far only tested at the {{T60}}.<br />
* [http://www.zolnott.de/software/applications/ibm-acpi-applet-for-gnome-210-and-higher.html IBM ACPI applet] is a small gnome panel applet which shows the fan speed and thermal informations.<br />
* There is an [http://munin.projects.linpro.no/wiki/plugin-ibm_acpi ibm_acpi plugin] for [http://munin.projects.linpro.no/ Munin].<br />
* [http://sensors-applet.sourceforge.net/ GNOME Sensors Applet] supports ibm_acpi.<br />
<br />
==Sensor locations==<br />
This information is model specific.<br />
<br />
===ThinkPad {{R51}}===<br />
The [[ibm-acpi]] documentation includes the report by Thomas Gruber:<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 Mini-PCI<br />
0x7A 3 HDD<br />
0x7B 4 GPU<br />
0x7C 5 System battery<br />
0x7D 6 UltraBay battery<br />
0x7E 7 System battery<br />
0x7F 8 UltraBay battery<br />
0xC0 none ?<br />
0xC1 none ?<br />
0xC2 none ?<br />
<br />
===ThinkPad {{T40}}===<br />
The location of one of the sensors is identified [http://forum.thinkpads.com/viewtopic.php?t=11574 here].<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 System board under rear left corner of Mini-PCI module<br />
0x7A 3 ?<br />
0x7B 4 GPU<br />
0x7C 5 Battery<br />
0x7D 6 n/a<br />
0x7E 7 Battery<br />
0x7F 8 n/a<br />
0xC0 none n/a<br />
0xC1 none n/a<br />
0xC2 none n/a<br />
<br />
===ThinkPad {{T43}}, {{T43p}}===<br />
Found by Shmidoax using cooling spray to cool down components and observe the effect on the sensors.<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 Between PCMCIA slot and CPU (same as HDAPS module)<br />
0x7A 3 PCMCIA slot<br />
0x7B 4 GPU<br />
0x7C 5 System battery (front left = charging circuit)<br />
0x7D 6 UltraBay battery?<br />
0x7E 7 System battery (rear right)<br />
0x7F 8 UltraBay battery?<br />
0xC0 none Bus between Northbridge and DRAM<br />
0xC1 none Southbridge (under Mini-PCI card, under touchpad)<br />
0xC2 none Power circuitry, on underside of system board under F2 key<br />
{{gallery_start}}<br />
{{thumb|T43-thermal-sensors.jpg|ThinkPad T43 sensor locations}}<br />
{{thumb|T43-2668-thermal-sensors-zoom.jpg|ThinkPad T43 sensor locations detail}}<br />
{{thumb|T43p-H8S2161.jpg|ThinkPad T43/p 26xx Embedded Controller Renesas H8S/2161BV}}<br />
{{gallery_end}}<br />
<br />
===ThinkPad {{T60}}===<br />
Found by Marco Kraus for use in [http://www.kraus.tk/projects/IBMDoK/ IBMDok].<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU 0<br />
0x79 2 HDD<br />
0x7A 3 HDD<br />
0x7B 4 GPU<br />
0x7C 5 Battery<br />
0x7D 6 n/a<br />
0x7E 7 Battery<br />
0x7F 8 n/a<br />
0xC0 none ?<br />
0xC1 none ?<br />
0xC2 none ?<br />
<br />
The CPU thermal sensors seem to be exposed in both {{path|/proc/acpi/thermal_zone/THM0/temperature}} and {{path|/proc/acpi/thermal_zone/THM1/temperature}}, though the latter curiously seems to exist only in this file and nowhere in {{path|/proc/acpi/ibm/ecdump}}.<br />
<br />
===ThinkPad {{A31}}===<br />
Found by Milos Popovic using cooling spray to cool down components on a completely removed, running motherboard, to locate the sensors.<br />
EC offset Index in "thermal" Location (estimated)<br />
0x78 1 CPU<br />
0x79 2 Battery (this one heats up when on battery power)<br />
0x7A 3 Power (sensor near power diodes and CPU; heats up when high power consumption, has crosstalk from CPU)<br />
0x7B 4 Ultrabay 2000 battery?<br />
0x7C 5 Northbridge (sensor next to Northbridge, also somewhat near GPU)<br />
0x7D 6 PCMCIA/ambient (sensor is a National Semiconductor LM75 Digital Temperature Sensor/Thermal Watchdog chip<br />
next to the 9-pin VGA connector; sits right under PCMCIA slots but doesn't touch)<br />
0x7E 7 Battery (this one stays near ambient temperature, even when on battery power)<br />
0x7F 8 Ultrabay 2000 battery?<br />
0xC0 none zero<br />
0xC1 none zero<br />
0xC2 none zero</div>Miloshttps://www.thinkwiki.org/w/index.php?title=How_to_control_fan_speed&diff=25243How to control fan speed2006-10-14T01:53:24Z<p>Milos: </p>
<hr />
<div>This page discusses methods for controlling the system fan.<br />
<br />
==For Linux==<br />
===Using a patched kernel===<br />
<br />
The [[Patch for controlling fan speed]] provides a convenient interface via {{path|/proc/acpi/ibm/fan}}.<br />
<br />
Manual speed control can be done through the [[patch for controlling fan speed]]:<br />
<br />
'''#cat /proc/acpi/ibm/fan'''<br />
status: enabled<br />
level: auto<br />
speed: 4219<br />
commands: enable, disable, level <level><br />
(<level> is 0-7, auto or disengaged)<br />
<br />
'''#echo level 2 > /proc/acpi/ibm/fan'''<br />
<br />
'''#cat /proc/acpi/ibm/fan'''<br />
status: enabled<br />
level: 2<br />
speed: 3142<br />
commands: enable, disable, level <level><br />
(<level> is 0-7, auto or disengaged)<br />
<br />
===Using a stock kernel===<br />
<br />
If you have the [[ibm-acpi]] module loaded with <tt>experimental=1</tt>, you can control the fan without patching the kernel by directly writing to the relevant embedded controller register using {{path|/proc/acpi/ibm/ecdump}}. <br />
<br />
For example:<br />
<br />
{{cmdroot|echo 0x2F 0x00 > /proc/acpi/ibm/ecdump}} (fan off)<br />
<br />
{{cmdroot|echo 0x2F 0x02 > /proc/acpi/ibm/ecdump}} (low speed)<br />
<br />
{{cmdroot|echo 0x2F 0x04 > /proc/acpi/ibm/ecdump}} (medium speed)<br />
<br />
{{cmdroot|echo 0x2F 0x07 > /proc/acpi/ibm/ecdump}} (maximum speed)<br />
<br />
{{cmdroot|echo 0x2F 0x80 > /proc/acpi/ibm/ecdump}} (automatic - default)<br />
<br />
{{cmdroot|echo 0x2F 0x40 > /proc/acpi/ibm/ecdump}} (disengaged)<br />
<br />
Ssee the specifications below for the meaning of these modes.<br />
<br />
===On/off control using stock kernel===<br />
<br />
If you only wish to turn the fan on and off (with automatic control when it's on), you can use the following.<br />
<br />
When loading [[ibm-acpi]] v0.11 with experimental switch ({{cmdroot|1=modprobe ibm_acpi experimental=1}}), it is possible to read and write the status of fan:<br />
<br />
'''#cat /proc/acpi/ibm/fan'''<br />
status: enabled<br />
speed: 3580<br />
commands: enable, disable<br />
<br />
'''#echo disable > /proc/acpi/ibm/fan'''<br />
<br />
'''cat /proc/acpi/ibm/fan'''<br />
status: disabled<br />
speed: 0<br />
commands: enable, disable<br />
<br />
When off, the fan will then '''never''' wake up. It is advised to use an automated control script to reduce the chance of hardware damage.<br />
<br />
===Automated control scripts===<br />
<br />
An [[ACPI fan control script#Variable speed control scripts|ACPI fan control script]] can be to override the firmware's fan algorithm with gentler, quieter version. It monitors the laptop's [[thermal sensors]] and sets the fan speed accordingly, according to customizable thresholds. For the default behavior, simply save the [[ACPI fan control script#Variable speed control scripts|script]] as {{path|tp-fancontrol}} and run<br /><br />
{{cmdroot|./tp-fancontrol}}<br />
<br />
==For Windows==<br />
<br />
Shimodax's ThinkPad fan control tool offers similar functionality (see [http://forum.thinkpads.com/viewtopic.php?t=17715 forum discussion] at thinkpads.com). Source and binaries are available through the [http://sourceforge.net/projects/tp4xfancontrol "Tp4xFanControl"] project on SourceForge.<br />
<br />
==Hardware specs==<br />
<br />
The following hardware behavior was discovered experimentally by [[User:Thinker|Thinker]] and neither provided by nor confirmed by IBM/Lenovo. The following description may be inaccurate and may vary by model (see list of models above). The terminology probably does not match the one used by IBM/Lenovo engineers.<br />
<br />
ACPI DSDT register _SB.PCI0.LPC.EC.HFSP (8 bits, offset 0x2F in the <tt>EmbeddedController</tt> address space, accessed through the standard EC interface at IO ports 0x62 and 0x66) is read/writable and has the following meaning:<br />
<br />
Bits 7 6 5 4 3 2 1 0<br />
---------------<br />
Value 1 0 * * * * * * - automatic<br />
* 1 * * * * * * - disengaged<br />
0 0 N N N N N N - manual (0..63; 0=disable fan, 1=min, ..., 7=max)<br />
<br />
In ''automatic'' mode, the embedded controller sets the fan speed automatically according to system temperatures and some unknown algorithm.<br />
<br />
In ''manual'' mode, the fan level is forced to the given value and the EC will auto-regulate the fan to maintain at a (roughly) constant RPM, which is model-dependent. Manual speed levels 8-63 yield the same behavior as level 7, and the the ACPI DSDT uses level 7 for the emergency mode it enters upon critical CPU/GPU temperature, so apparently 7 is the real maximum level.<br />
<br />
In ''disengaged'' mode, the embedded controller does not read the fan RPM (hence <tt>EmbeddedController</tt> offset 0x84 is not updated), and does not maintain a stable fan speed. When disengaged mode is entered the fan speed is not immediately changed (except if the fan was disabed, in which case it is turned on at a low level). However, once in disengaged mode, fan speed will slowly increase to ''beyond'' the maximum manual level (this may cause hardware damage!).<br />
<br />
After boot, the register may not reflect the true state of the EC (on some models it reads 0x07 even though the EC is actually in automatic mode).<br />
<br />
{{HINT|Apparently the [[Problem with fan noise|pulsing fan noise]] experienced by some users can be cured by repeatedly running 2-4 seconds of manual control followed by 0.5-1 seconds of disengaged mode. The pulse occurs when the the embedded controller computes the fan speed and adjusts the fan voltage adaptively every few seconds (~4.8sec for the ThinkPad T43); the aforementioned mode switching doesn't give it a chance to do so. One of the [[ACPI fan control script#Variable speed control scripts|ACPI fan control scripts]] implements this solution.}}<br />
<br />
==Supported models==<br />
<br />
The above was successfully tested on the following models:<br />
<br />
* ThinkPad {{T43}}, {{T43p}} (fan levels RPM: 1-2 = ~3300, 3-5 = ~4100, 6-7 = ~4700; disengaged mode works)<br />
* ThinkPad {{T42}}, {{T42p}} (fan levels RPM: 1-2 = ~2900, 3-5 = ~3700, 6-7 = ~4700; disengaged mode works at ~5200)<br />
* ThinkPad {{T41}}, {{T41p}} (fan levels RPM: 1-2 = ~2980, 3-5 = ~3500, 6-7 = ~4050; disengaged mode works at ~5100)<br />
* ThinkPad {{T40}} (fan levels RPM: 1-2 = ~2950, 3-5 = ~3600, 6-7 = ~4050)<br />
* ThinkPad {{T30}}<br />
* ThinkPad {{T22}}<br />
* ThinkPad {{T23}} (low speed = ~2200, medium and maximum speed = ~4800; disengaged mode works at ~5800)<br />
* ThinkPad {{R52}}<br />
* ThinkPad {{R50}} (highest manual level is 3; disengage mode works and reaches much higher RPM)<br />
* ThinkPad {{R50p}} (disengaged mode works at ~5100)<br />
* ThinkPad {{R51}} (level 0 = off, level 1-2 = ~3150, level 3-5 = ~3350, level 6 = ~3750, disengaged = ~5100)<br />
* ThinkPad {{X30}} (level 0 = off, low = ~3900, medium = ~4200, maximum = ~4650, disengaged = ~5900)<br />
* ThinkPad {{X31}}<br />
* ThinkPad {{X40}}<br />
* ThinkPad {{X41T}}<br />
* ThinkPad {{Z60t}} (fan levels RPM: 1-2 = ~1700, 3-5 = ~2800, 6-7 = ~3500)<br />
* ThinkPad {{Z60m}} (fan levels like Z60t)<br />
* ThinkPad {{X60}}<br />
* ThinkPad {{A31}} (fan levels RPM: 0 = off, 1-2 = ~3280-3380 (!), 3-5 = ~3200, 6-7 = ~3380, disengaged = ~4000)<br />
Probably other models are supported too (please update this page if you confirm this).<br />
<br />
==Models using a different interface==<br />
<br />
The following models also work, use a different access method which supported (only) via the {{path|/proc/acpi/ibm/fan}} of [[ibm-acpi]]. No need for patching.<br />
<br />
* ThinkPad {{600E}}, {{600X}}, {{770E}}, {{770X}} (these use a different fan control interface)<br />
<br />
==Unsupported models==<br />
<br />
* ThinkPad {{560}} (these models don't have a fan)</div>Milos