Power management

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Notes: probably most general article on ArchWiki on this topic (Discuss in Talk:Power management#)

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Notes: The purpose of this article currently overlaps other introductions like General Recommendations#Power management and Laptop#Power Management; application-specific information must be moved to the respective articles; only a generic introduction to power management in Arch and to related articles should stay here. (Discuss in Talk:Power management#)

The aim of this page is to try to gather all the informations which are available on the topic of linux power management features. There are several places where one can change power management settings:

Power settings you set in one place could be overwritten in another place.

Power saving

See power saving.

Kernel Command Line Parameters

See Kernel modules#Using kernel command line for more information.

Enable RC6 Power Save Options

 i915_enable_rc6=#Nr

Where #Nr:

  • 1: enable rc6
  • 3: enable rc6 and deep rc6
  • 5: enable rc6 and deepest rc6
  • 7: enable rc6, deep and deepest rc6

Troubleshooting

Connection problems with Atheros AR9485 Wireless Network Adapter

You may experience connection problems with the Atheros AR9485 Wireless Network Adapter, which is caused by incorrect power management functioning. You can notice the problem if you're experiencing random disconnections in IM or other software that keeps connection alive for a long time. In case you're using laptop, first you must disable battery power-over-perfomance feature: Settings / Power Manager / On Battery / Prefer power savings over perfomance

Next thing to do is switch off power management for adapter: You should add

iwconfig wlan0 power off
(assuming wlan0 is your AR9485 adapter) anywhere it can be executed on system init (or simply run it once, to fix the problem for current session) and that should do it.

See Also

CPU Frequency Scaling