How to reduce power consumption - Revision history

ThinkGNU: If there's a single Wi-Fi card, it's generally wlan0, not eth1. Grammar. 1000BASE-T require auto-negotiation and most networks are 1000BASE-T now - with the exception of now rare 100BASE-TX networks.

2025-10-27T02:37:23Z

If there's a single Wi-Fi card, it's generally wlan0, not eth1. Grammar. 1000BASE-T require auto-negotiation and most networks are 1000BASE-T now - with the exception of now rare 100BASE-TX networks.

WilliamPoetra: /* LCD Backlight/Brightness */

2015-10-28T01:23:15Z

‎LCD Backlight/Brightness

WilliamPoetra: /* LCD Backlight/Brightness */

2015-10-28T01:21:25Z

‎LCD Backlight/Brightness

WilliamPoetra: code cleanup

2015-10-28T01:06:55Z

code cleanup

Show changes

WilliamPoetra: /* Tools */

2015-10-28T01:02:29Z

‎Tools

Monnier: Mention use of host2 for sata link power management on T61

2012-12-04T19:52:33Z

Mention use of host2 for sata link power management on T61

Denisq: forcing hpet adds "Clock Event Device: hpet" in /proc/timer_list

2011-03-02T00:47:02Z

forcing hpet adds "Clock Event Device: hpet" in /proc/timer_list

SpeedEvil: /* intel wireless */

2011-02-08T11:31:18Z

‎intel wireless

MarcH: /* Kernel boot and module loading options */ added X40

2010-11-20T20:27:59Z

‎Kernel boot and module loading options: added X40

Telstar: /* Kernel boot and module loading options */

2010-11-02T15:36:28Z

‎Kernel boot and module loading options

@@ Line 430: / Line 430: @@
 performances) by activating the power saving modes:
-  iwpriv eth1 set_power 5
+  iwpriv wlan0 set_power 5
 For drivers using the new Wi-Fi kernel framework (mac80211/cfg80211),
@@ Line 475: / Line 475: @@
 interrupts and CPU wakeups.
-Forcing 100Mbps full-duplex speed on a gigabit ethernet NIC can also save a lot of power (~1W) on most network workloads. This also reduces components temperature (e.g., [[Thermal Sensors|thermal sensor]] 0xC0 on the {{T43}} cools down by 5 degree between 1000Mbps and 100Mbps, and another 1 degree for 10Mbps).
+Forcing 100Mbps full-duplex speed on a gigabit ethernet NIC can also save a lot of power (~1W) on most network workloads. This also reduces component temperatures (e.g., [[Thermal Sensors|thermal sensor]] 0xC0 on the {{T43}} cools down by 5 degrees between 1000Mbps and 100Mbps, and another 1 degree for 10Mbps).
    ethtool -s eth0 autoneg off speed 100
-Note, however, that if the network device on the other side has auto-negotiation enabled (which is very common) and you turn auto-negotiation off, the other side will assume half-duplex mode and you will experience a significant loss of performance.
+Note, however, that if the network device on the other side has auto-negotiation enabled (which is almost guaranteed) and you turn auto-negotiation off, the other side will assume half-duplex mode and you will experience a significant loss of performance.
 ==Bluetooth==
@@ Line 512: / Line 512: @@
 * <code>sysctl vm.block_dump=1</code> # and look at dmesg
 * <code>ps aux | awk '{print$10,$11}' | sort -n</code> # will list all running softs sorted by used cpu time
-Please, don't forget to fill a bug when you find such a misbehaving software.
+Please consider filling a bug if you identify such misbehaving software.
-{{NOTE|Not all software is evil, buggy or badly written. Some produce regular activity because they have to, in order to provide their intented functionality.  Think twice before filling bugs about this.}}
+{{NOTE|Not all software is evil, buggy or badly written. Some produce regular activity as it is required to provide the intended functionality.  Think twice before filling bugs about this.}}
 ==See Also==

← Older revision		Revision as of 01:23, 28 October 2015
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	xset dpms 0 0 300		xset dpms 0 0 300

		+	===Screensaver method===
	Alternatively, you can add a screensaver that does nothing but blank the screen and turn off the display. In this example, I'm using Linux Mint MATE 17.2, please adjust the keywords below accordingly. Also, you will need to enable DPMS as above, or as in [[How to make ACPI work#Screen blanking (Standby)]].		Alternatively, you can add a screensaver that does nothing but blank the screen and turn off the display. In this example, I'm using Linux Mint MATE 17.2, please adjust the keywords below accordingly. Also, you will need to enable DPMS as above, or as in [[How to make ACPI work#Screen blanking (Standby)]].

@@ Line 294: / Line 294: @@
   xset +dpms
   xset dpms 0 0 300
 ==Graphic controllers==

@@ Line 24: / Line 24: @@
 Beside CPU wakeups, disks spins are also power hungry. To detect what make your disk spinning,
   sysctl vm.block_dump=1
 will list all applications causing disks wakeups on the kernel's dmesg.

@@ Line 201: / Line 201: @@
   echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
   echo min_power > /sys/class/scsi_host/host1/link_power_management_policy
 </code>
@@ Line 258: / Line 259: @@
   echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
   echo min_power > /sys/class/scsi_host/host1/link_power_management_policy
 </code>
 Disable it by replacing <code>min_power</code> with <code>max_performance</code>.
 On Ubuntu Hardy Heron with a 2.6.24-16 kernel, a suspend/resume cycle is much quicker if you disable SATA Link Power Management before initiating the suspend. As of Intrepid Ibex and kernel 2.6.27, this should be fixed. ([https://bugs.launchpad.net/linux/+bug/234047 Launchpad bug 234047], [http://bugzilla.kernel.org/show_bug.cgi?id=10817 Kernel bug 10817])

@@ Line 143: / Line 143: @@
 * {{X22}}, {{X23}}, {{X24}}, {{X30}}, {{X31}}, {{X40}}
 * {{A31}}
 {{HELP|please add your ThinkPad to the above list, if <nowiki>hpet=force</nowiki> was required}}

@@ Line 483: / Line 483: @@
 reduce network card interrupts, therefore power savings. This shouldn't have
 negatives side effects.
 See also, to activate power saving on the wireless network card: