X301 Power Savings - Revision history

Gfbarros: added category

2009-04-04T18:19:26Z

added category

Gfbarros: footnotes

2009-04-04T18:18:06Z

footnotes

Gfbarros: formating

2009-04-04T18:11:02Z

formating

Gfbarros: typo fix

2009-04-04T18:08:29Z

typo fix

Gfbarros: mentioned fedora version used

2009-04-04T18:07:45Z

mentioned fedora version used

Gfbarros: added external resources

2009-04-04T18:06:49Z

added external resources

Gfbarros: â†Created page with '== x301 Power Savings == The standard Fedora configuration provides for a lot of leeway in power savings. Here are the items I have modified that got me from around 11W t...'

2009-04-04T18:00:37Z

â†Created page with '== x301 Power Savings == The standard Fedora configuration provides for a lot of leeway in power savings. Here are the items I have modified that got me from around 11W t...'

New page

== x301 Power Savings ==

The standard Fedora configuration provides for a lot of leeway in power savings. Here are the items I have modified that got me from around 11W to around 7W. powertop is an invaluable tool in figuring out how much power is being drawn by each component, not to mention seeing your progress. A lot of this information is covered in other pages, but this is specific to the x301.

*I don't use bluetooth on a regular day...<br>
<code>
echo disabled > /proc/acpi/ibm/bluetooth
</code>

*The video system keeps one or more of the external connectors powered up at all times.
Anything wish a '*' next to the mode is powered on:

<code>
[root@x301 ~]# xrandr
Screen 0: minimum 320 x 200, current 1440 x 900, maximum 8192 x 8192
VGA1 connected (normal left inverted right x axis y axis)
1024x768 60.0
800x600 60.3
640x480 59.9
LVDS1 connected 1440x900+0+0 (normal left inverted right x axis y axis) 287mm x 180mm
1440x900 60.0*+ 50.0
DVI1 disconnected (normal left inverted right x axis y axis)
DVI2 connected (normal left inverted right x axis y axis)
1024x768 60.0*
800x600 60.3
640x480 59.9
</code>

So disable them with
<code>
xrandr --output DVI2 --off
</code>

*By default, the wifi driver keeps the card at the maximum power setting for better performance. If you are just browsing the web or not using a lot of bandwidth significant savings can be had by reducing this setting.
<code>
echo 5 > /sys/class/net/wlan0/device/power_level
</code>

*Newer kernels are much smarter about how they load the cores on a CPU, this setting tells it to be more power efficient rather than performance oriented.
<code>
echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
</code>

*Hal will constantly poll the cdrom to see if a disk has been inserted and if it should mount and open it for you in X. Disabling this allows the cpu to sleep longer.
<code>
hal-disable-polling --device /dev/cdrom
</code>

*New features in the SATA driver allows it to power down the link when not utilized, make sure to enable on all paths with
<code>
for foo in /sys/class/scsi_host/host*/link_power_management_policy;
do echo min_power > $foo;
done
</code>

*Similar savings can be had by setting the pcie bus to a more power-friendly mode
<code>
echo powersave > /sys/module/pcie_aspm/parameters/policy
</code>

*The douns hardware also has power savings settings
<code>
echo 5 > /sys/module/snd_hda_intel/parameters/power_save
echo Y > /sys/module/snd_hda_intel/parameters/power_save_controller
</code>

*Turning off Wake-On-Lan will save some power while your system is suspended or hibernated
<code>
ethtool -s eth0 wol d
</code>

*Powering down the usb bus while not in use is also beneficial
<code>
usbcore.autosuspend=1
</code>

← Older revision		Revision as of 18:19, 4 April 2009
Line 1:		Line 1:
		+	[[Category: X301]]
	== x301 Power Savings ==		== x301 Power Savings ==

← Older revision		Revision as of 18:06, 4 April 2009
Line 74:		Line 74:
	usbcore.autosuspend=1		usbcore.autosuspend=1
	</code>		</code>
		+
		+	==External Resources==
		+	* [http://itgen.blogspot.com/2009/03/energy-management-in-linux.html Energy management in Linux]
		+	* [http://www.linuxpowertop.org PowerTOP] website
		+	* [http://www.lesswatts.org/tips/index.php Less Watts Tips & Tricks]

@@ Line 35: / Line 35: @@
 <br>
-*By default, the wifi driver keeps the card at the maximum power setting for better performance. If you are just browsing the web or not using a lot of bandwidth significant savings can be had by reducing this setting.
+*By default, the wifi driver keeps the card at the maximum power setting for better performance. If you are just browsing the web or not using a lot of bandwidth significant savings can be had by reducing this setting.{{footnote|1}}
 <code>
   echo 5 > /sys/class/net/wlan0/device/power_level
@@ Line 41: / Line 41: @@
 <br>
-*Newer kernels are much smarter about how they load the cores on a CPU, this setting tells it to be more power efficient rather than performance oriented.
+*Newer kernels are much smarter about how they load the cores on a CPU, this setting tells it to be more power efficient rather than performance oriented.{{footnote|2}}
 <code>
   echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
@@ Line 53: / Line 53: @@
 <br>
-*New features in the SATA driver allows it to power down the link when not utilized, make sure to enable on all paths with
+*New features in the SATA driver allows it to power down the link when not utilized, make sure to enable on all paths with{{footnote|3}}
 <code>
   for foo in /sys/class/scsi_host/host*/link_power_management_policy;
@@ Line 84: / Line 84: @@
   usbcore.autosuspend=1
 </code>
 ==External Resources==

@@ Line 2: / Line 2: @@
 The standard Fedora configuration provides for a lot of leeway in power savings. Here are the items I have modified that got me from around 11W to around 7W. powertop is an invaluable tool in figuring out how much power is being drawn by each component, not to mention seeing your progress. A lot of this information is covered in other pages, but this is specific to the x301. Note that these settings were tested on an x301 running a fresh Fedora 11 Beta install.
 *I don't use bluetooth on a regular day...<br>
@@ Line 7: / Line 8: @@
   echo disabled > /proc/acpi/ibm/bluetooth
 </code>
 *The video system keeps one or more of the external connectors powered up at all times.
-Anything wish a '*' next to the mode is powered on:
+Anything with a '*' next to the mode is powered on:
 <code>
@@ Line 31: / Line 33: @@
   xrandr --output DVI2 --off
 </code>
 *By default, the wifi driver keeps the card at the maximum power setting for better performance. If you are just browsing the web or not using a lot of bandwidth significant savings can be had by reducing this setting.
@@ Line 36: / Line 39: @@
   echo 5 > /sys/class/net/wlan0/device/power_level
 </code>
 *Newer kernels are much smarter about how they load the cores on a CPU, this setting tells it to be more power efficient rather than performance oriented.
@@ Line 41: / Line 45: @@
   echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
 </code>
 *Hal will constantly poll the cdrom to see if a disk has been inserted and if it should mount and open it for you in X. Disabling this allows the cpu to sleep longer.
@@ Line 46: / Line 51: @@
   hal-disable-polling --device /dev/cdrom
 </code>
 *New features in the SATA driver allows it to power down the link when not utilized, make sure to enable on all paths with
@@ Line 53: / Line 59: @@
   done
 </code>
 *Similar savings can be had by setting the pcie bus to a more power-friendly mode
@@ Line 58: / Line 65: @@
   echo powersave > /sys/module/pcie_aspm/parameters/policy
 </code>
 *The sound hardware also has power savings settings
@@ Line 64: / Line 72: @@
   echo Y > /sys/module/snd_hda_intel/parameters/power_save_controller
 </code>
 *Turning off Wake-On-Lan will save some power while your system is suspended or hibernated
@@ Line 69: / Line 78: @@
   ethtool -s eth0 wol d
 </code>
 *Powering down the usb bus while not in use is also beneficial

@@ Line 59: / Line 59: @@
 </code>
-*The douns hardware also has power savings settings
+*The sound hardware also has power savings settings
 <code>
   echo 5 > /sys/module/snd_hda_intel/parameters/power_save