ALSA: HDA: add powersaving hook for Realtek

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The current Realtek code makes no specific provision for turning stuff
off. The codec chip is placed into low-power mode generically, but this
doesn't turn off any external hardware connected to it, in particular
external amplifiers.

This patch creates a hook function that is called by the codec
suspend/resume functions. It ought to disable any external hardware in a
device-specific way. I've implemented a generic ALC889 function that
sets the EAPD pin properly, and used it for the Acer Aspire 8930G which
can benefit from this feature.

On my laptop, this results in ~0.5W extra savings.

Signed-off-by: Hector Martin <hector@marcansoft.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Hector Martin 2009-12-20 22:51:31 +01:00 • committed by Takashi Iwai

parent 556eea9a92

commit f5de24b06a

1 changed files with 36 additions and 0 deletions

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sound/pci/hda/patch_realtek.c

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