Laptop-mode - Revision history

Floffe: Undo spam "Under construction" message

2010-11-15T15:12:51Z

Undo spam "Under construction" message

Edotowiza at 00:16, 15 November 2010

2010-11-15T00:16:40Z

AlexBiddle at 19:07, 6 September 2010

2010-09-06T19:07:57Z

Dhruv: Added info on ubuntu laptop-mode

2007-06-24T02:53:43Z

Added info on ubuntu laptop-mode

Hypnotoad: Note regarding suse / powersaved

2006-07-15T18:33:11Z

Note regarding suse / powersaved

Hmh: Much better explanation for "invisible" commands waking up the disk, mention lm-profiler and smartd

2006-05-24T00:25:43Z

Much better explanation for "invisible" commands waking up the disk, mention lm-profiler and smartd

Thinker: Model details for hddtemp issue

2005-09-28T13:58:13Z

Model details for hddtemp issue

Thinker: hddtemp issue

2005-09-28T13:52:10Z

hddtemp issue

Wyrfel at 02:16, 9 May 2005

2005-05-09T02:16:17Z

Wyrfel at 02:16, 9 May 2005

2005-05-09T02:16:08Z

@@ Line 10: / Line 10: @@
->=== Keeping the disk in the stand-by state ===
+=== Keeping the disk in the stand-by state ===
 Laptop-mode is only effective if one avoids spinning up the disk for frivoulous reasons.  What will spin a disk up is dependent on the HD firmware, but unfortunately most will spin up on just about every command.  To add insult to injury, ATA/SATA pass-through commands are not logged through the {{path|/proc/sys/vm/block_dump}} facility, and thus invisible to tools like '''lm-profiler'''.
@@ Line 16: / Line 16: @@
 {{HINT|The '''lm-profiler''' tool from laptop-mode-tools can be used to list all processes doing normal disk access.}}
-In systems where the HD spins up too easily, the &quot;'''hddtemp'''&quot; daemon will wake up the disk every minute, and must thus be disabled for power management to be effective.  The &quot;'''smartd'''&quot; daemon is also an offender, but fortunately its default configuration issues commands to the HDs only every 30 minutes.
+In systems where the HD spins up too easily, the "'''hddtemp'''" daemon will wake up the disk every minute, and must thus be disabled for power management to be effective.  The "'''smartd'''" daemon is also an offender, but fortunately its default configuration issues commands to the HDs only every 30 minutes.
-{{HINT|smartd can be configured to never issue commands to the disk if it is in the sleep or standby states, through the use of option &quot;'''-n standby,q'''&quot;.  The &quot;''',q'''&quot; is needed to supress syslog messages.}}
+{{HINT|smartd can be configured to never issue commands to the disk if it is in the sleep or standby states, through the use of option "'''-n standby,q'''".  The "''',q'''" is needed to supress syslog messages.}}
 === Hard drive noise using laptop-mode ===

@@ Line 10: / Line 10: @@
-=== Keeping the disk in the stand-by state ===
+>=== Keeping the disk in the stand-by state ===
 Laptop-mode is only effective if one avoids spinning up the disk for frivoulous reasons.  What will spin a disk up is dependent on the HD firmware, but unfortunately most will spin up on just about every command.  To add insult to injury, ATA/SATA pass-through commands are not logged through the {{path|/proc/sys/vm/block_dump}} facility, and thus invisible to tools like '''lm-profiler'''.
@@ Line 16: / Line 16: @@
 {{HINT|The '''lm-profiler''' tool from laptop-mode-tools can be used to list all processes doing normal disk access.}}
-In systems where the HD spins up too easily, the "'''hddtemp'''" daemon will wake up the disk every minute, and must thus be disabled for power management to be effective.  The "'''smartd'''" daemon is also an offender, but fortunately its default configuration issues commands to the HDs only every 30 minutes.
+In systems where the HD spins up too easily, the &quot;'''hddtemp'''&quot; daemon will wake up the disk every minute, and must thus be disabled for power management to be effective.  The &quot;'''smartd'''&quot; daemon is also an offender, but fortunately its default configuration issues commands to the HDs only every 30 minutes.
-{{HINT|smartd can be configured to never issue commands to the disk if it is in the sleep or standby states, through the use of option "'''-n standby,q'''".  The "''',q'''" is needed to supress syslog messages.}}
+{{HINT|smartd can be configured to never issue commands to the disk if it is in the sleep or standby states, through the use of option &quot;'''-n standby,q'''&quot;.  The &quot;''',q'''&quot; is needed to supress syslog messages.}}
 === Hard drive noise using laptop-mode ===

← Older revision		Revision as of 19:07, 6 September 2010
Line 19:		Line 19:

	{{HINT\|smartd can be configured to never issue commands to the disk if it is in the sleep or standby states, through the use of option "'''-n standby,q'''". The "''',q'''" is needed to supress syslog messages.}}		{{HINT\|smartd can be configured to never issue commands to the disk if it is in the sleep or standby states, through the use of option "'''-n standby,q'''". The "''',q'''" is needed to supress syslog messages.}}
		+
		+	=== Hard drive noise using laptop-mode ===
		+
		+	The use of laptop-mode can cause a recurrence of the bug https://bugs.launchpad.net/ubuntu/+source/acpi-support/+bug/59695 known to affect Ubuntu distributions, which causes the spindle of the hard drive to be parked too frequently. This is caused by laptop-mode setting the Advanced Power Management feature of the hard drive in /etc/laptop-mode/laptop-mode.conf.
		+
		+	Ubuntu is not completely at fault, as the hard drive manufacturer should set an appropriate graduation between hard drive longevity and power saving using a value between 1 and 255. (more information can be found in the hdparm manual page under the -B flag).
		+
		+	Values up to 127 can cause unacceptable noise and wear of a hard drive (for more information on Load_Cycle_Counts and hard drive wear, see above bug report). An acceptable balance can be found using hdparm:
		+
		+	sudo hdparm -B 254 /dev/sdX
		+
		+	This value can then be entered into /etc/laptop-mode/laptop-mode.conf, first ensuring laptop-mode is set to control hdparm...
		+
		+	CONTROL_HD_POWERMGMT=1
		+
		+	...then by changing the default values:
		+
		+	BATT_HD_POWERMGMT=254
		+	LM_AC_HD_POWERMGMT=254
		+	NOLM_AC_HD_POWERMGMT=254
		+

	[[Category:Glossary]]		[[Category:Glossary]]

← Older revision		Revision as of 02:53, 24 June 2007
Line 7:		Line 7:

	{{NOTE\|The use of Laptop-mode and laptop-mode-tools is not recommended in SuSE Linux. The supplied <tt>powersaved</tt> already takes care of everything regarding power saving}}		{{NOTE\|The use of Laptop-mode and laptop-mode-tools is not recommended in SuSE Linux. The supplied <tt>powersaved</tt> already takes care of everything regarding power saving}}
		+	{{NOTE\| Laptop-mode is disabled by default on Ubuntu 6.10 and later. See [http://samwel.tk/laptop_mode/packages/ubuntu here] for more details}}.
		+

	=== Keeping the disk in the stand-by state ===		=== Keeping the disk in the stand-by state ===

@@ Line 5: / Line 5: @@
 Almost anything you need to know about laptop-mode can be read in your Linux kernel documentation at /usr/src/linux/Documentation/laptop-mode.txt<br>
 If you can not find this file on your laptop, then go and get yourself the latest kernel sources.
 === Keeping the disk in the stand-by state ===

@@ Line 6: / Line 6: @@
 If you can not find this file on your laptop, then go and get yourself the latest kernel sources.
-Note that on some laptops the "hddtemp" daemon will wake up the disk every minute, and must thus be disabled for power management to be effective. Unlike other processes, hddtemp's accesses are not visibile through the {{path|/proc/sys/vm/block_dump}} facility. (This issue was observed on a ThinkPad T43 2686-DGU with Fedora Core 4.)
+=== Keeping the disk in the stand-by state ===
 [[Category:Glossary]]

@@ Line 1: / Line 1: @@
-An often overlooked feature in 2.4.23+ and 2.6.6+ Linux kernels is the laptop-mode. It may be activated by writing a "5" into /proc/sys/vm/laptop_mode. Laptop-mode, when configured correctly, can make the kernel buffer disk activities for quite a long time and keep the harddisk spun down for most of the time to save power.
+An often overlooked feature in 2.4.23+ and 2.6.6+ Linux kernels is the laptop-mode. It may be activated by writing a "5" into {{path|/proc/sys/vm/laptop_mode}}. Laptop-mode, when configured correctly, can make the kernel buffer disk activities for quite a long time and keep the harddisk spun down for most of the time to save power.
 There is also a set of userland tools made to automatically manage all aspects of laptop-mode configuration according to the actual mode of operation (ac/battery-status). It is called [[laptop-mode-tools]] and you can install it in debian via apt-get or download it from [http://www.xs4all.nl/~bsamwel/laptop_mode/tools here].
@@ Line 6: / Line 6: @@
 If you can not find this file on your laptop, then go and get yourself the latest kernel sources.
 [[Category:Glossary]]

← Older revision		Revision as of 02:16, 9 May 2005
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−	{{Category:Glossary]]	+	[[Category:Glossary]]

← Older revision		Revision as of 02:16, 9 May 2005
Line 5:		Line 5:
	Almost anything you need to know about laptop-mode can be read in your Linux kernel documentation at /usr/src/linux/Documentation/laptop-mode.txt<br>		Almost anything you need to know about laptop-mode can be read in your Linux kernel documentation at /usr/src/linux/Documentation/laptop-mode.txt<br>
	If you can not find this file on your laptop, then go and get yourself the latest kernel sources.		If you can not find this file on your laptop, then go and get yourself the latest kernel sources.
		+
		+
		+	{{Category:Glossary]]