At Sun, 20 Dec 2009 23:00:57 +0100, Hector Martin wrote:
Missed a coupld #ifdefs, resending.
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.
This is nice. Maybe we should a bit more generalized also for other machines.
But now applied as is for the next pull request. Thanks.
Takashi