Difference between revisions of "Power saving"

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(Audio: latency)
(nmi watchdog)
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{{hc|/etc/modprobe.d/audio_power_save.conf|2=options snd_ac97_codec power_save=1}}
 
{{hc|/etc/modprobe.d/audio_power_save.conf|2=options snd_ac97_codec power_save=1}}
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==Disabling NMI watchdog==
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The [[Wikipedia:Non-maskable interrupt|NMI]] watchdog is a debugging feature to catch hardware hangs and cause a kernel panic. On some systems it can generate a lot of interrupts, causing a noticeable increase in power usage.
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{{hc|/etc/sysctl.d/disable_watchdog.conf|kernel.nmi_watchdog = 0}}
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or add {{ic|nmi_watchdog}} as a [[kernel parameter]].

Revision as of 23:31, 23 October 2012

Audio

By default, audio power saving is turned off by most drivers. It can be enabled by setting the power_save parameter to a time (in seconds) to go in idle.

Note: Toggling the audio card's power state can cause a popping sound or noticeable latency on some broken hardware.
Intel
/etc/modprobe.d/audio_power_save.conf
options snd_hda_intel power_save=1
ac97
/etc/modprobe.d/audio_power_save.conf
options snd_ac97_codec power_save=1

Disabling NMI watchdog

The NMI watchdog is a debugging feature to catch hardware hangs and cause a kernel panic. On some systems it can generate a lot of interrupts, causing a noticeable increase in power usage.

/etc/sysctl.d/disable_watchdog.conf
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or add nmi_watchdog as a kernel parameter.