[alsa-devel] [PATCH] HDA: add powersaving hook for Realtek

Hector Martin hector at marcansoft.com
Sun Dec 20 22:51:31 CET 2009

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.

Hector Martin (hector at marcansoft.com)
Public Key: http://www.marcansoft.com/marcan.asc

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