Problem with CPU frequency scaling - Revision history

Fhackenberger: /* Nothing else works and you know what you are doing? */

2016-09-21T11:28:59Z

‎Nothing else works and you know what you are doing?

2016-09-21T11:27:58Z

‎Nothing else works and you know what you are doing?

2016-09-21T11:27:24Z

‎Nothing else works and you know what you are doing?

2015-07-29T11:53:57Z

wikify

2011-07-14T12:24:10Z

‎Nothing else works and you know what you are doing?

2011-07-14T12:23:42Z

‎Nothing else works and you know what you are doing?

2011-07-14T12:23:15Z

‎Solution

2011-07-14T12:17:11Z

‎Affected Models

2011-07-14T12:16:30Z

‎Affected Models

2011-07-14T12:15:45Z

‎Affected Models

@@ Line 70: / Line 70: @@
 === Nothing else works and you know what you are doing? ===
-* Add "processor.ignore_ppc=1" to kernel boot command line or run {{cmduser|echo 1 | sudo tee /sys/module/processor/parameters/ignore_ppc}}. This allows to disable BIOS frequency limit, but can be cause the computer to malfunction if its power consumption is higher than 65W and you are running off a 65W AC power adapter with no battery installed.
+* Add "processor.ignore_ppc=1" to kernel boot command line or run {{cmduser|echo 1 &#124; sudo tee /sys/module/processor/parameters/ignore_ppc}}. This allows to disable BIOS frequency limit, but can be cause the computer to malfunction if its power consumption is higher than 65W and you are running off a 65W AC power adapter with no battery installed.
 == Affected Models ==

@@ Line 70: / Line 70: @@
 === Nothing else works and you know what you are doing? ===
-* Add "processor.ignore_ppc=1" to kernel boot command line or run "echo 1 | sudo tee /sys/module/processor/parameters/ignore_ppc". This allows to disable BIOS frequency limit, but can be cause the computer to malfunction if its power consumption is higher than 65W and you are running off a 65W AC power adapter with no battery installed.
+* Add "processor.ignore_ppc=1" to kernel boot command line or run {{cmduser|echo 1 | sudo tee /sys/module/processor/parameters/ignore_ppc}}. This allows to disable BIOS frequency limit, but can be cause the computer to malfunction if its power consumption is higher than 65W and you are running off a 65W AC power adapter with no battery installed.
 == Affected Models ==

@@ Line 70: / Line 70: @@
 === Nothing else works and you know what you are doing? ===
-* Add "processor.ignore_ppc=1" to kernel boot command line. This allows to disable BIOS frequency limit, but can be cause the computer to malfunction if its power consumption is higher than 65W and you are running off a 65W AC power adapter with no battery installed.
+* Add "processor.ignore_ppc=1" to kernel boot command line or run "echo 1 | sudo tee /sys/module/processor/parameters/ignore_ppc". This allows to disable BIOS frequency limit, but can be cause the computer to malfunction if its power consumption is higher than 65W and you are running off a 65W AC power adapter with no battery installed.
 == Affected Models ==

@@ Line 6: / Line 6: @@
 If the battery pack is removed and the laptop is powered by a 65W AC adapter only, the CPU downclocks to the lowest multiplier and remains locked in low speed. This happens irrespective of the scaling method in use (kernelspace or userspace) and of the frequency governor selected (ondemand, performance, etc.).
-Output of cpufreq-info (on AC power without battery):
+Output of {{cmduser|cpupower frequency-info}} (on AC power without battery):
    analyzing CPU 0:
@@ Line 30: / Line 30: @@
    current CPU frequency is 1000 MHz (asserted by call to hardware).
-Output of cpufreq-info (on AC power with battery plugged in):
+Output of {{cmduser|cpupower frequency-info}} (on AC power with battery plugged in):
    analyzing CPU 0:

@@ Line 70: / Line 70: @@
 === Nothing else works and you know what you are doing? ===
-* Add "processor.ignore_ppc=1" to kernel boot command line. This allows to disable BIOS frequency limit, but can be cause the computer to malfunction if its power consumption is higher than 65W.
+* Add "processor.ignore_ppc=1" to kernel boot command line. This allows to disable BIOS frequency limit, but can be cause the computer to malfunction if its power consumption is higher than 65W and you are running off a 65W AC power adapter with no battery installed.
 == Affected Models ==

@@ Line 62: / Line 62: @@
 ==Solution==
-Make sure no BIOS setting is limiting the CPU frequency range (like "thermal management" = "BALANCED").
+=== Is thermal mangament limiting the speed? ===
-# Buy a 90W AC adapter
+=== Is the ThinkPad running on a 65W power adapter? ===
-# Don't use the laptop without the battery pack
+* Either replace the 65W AC adapter with a 90W AC adapter, or
-Other solution than using the laptop with the battery pack always inserted is to add "processor.ignore_ppc=1" to kernel boot command line. This allows to disable BIOS frequency limit, but can be mischievous to the computer if it's power consumption is higher than 65W.
+=== Nothing else works and you know what you are doing? ===
 == Affected Models ==

@@ Line 71: / Line 71: @@
 == Affected Models ==
 * {{T410}}
 * {{T410s}}
@@ Line 80: / Line 81: @@
 * {{Z61m}}
-Probably ALL Lenovo ThinkPads.  One can actually track this through the DSDT, but it is not worth the effort.
+but it is probably true of all Lenovo ThinkPads.  One can actually track this through the DSDT, but it is not worth the effort.

@@ Line 75: / Line 75: @@
 * {{T61}}
 * {{T60p}}
 * {{X201}}
 * {{T410}}