Re: Re: power management in alsa

Takashi Iwai
2007-07-26T10:04:19Z

At Wed, 25 Jul 2007 18:41:50 +0000,
Pavel Machek wrote:
>
> Hi!
>
> > > I noticed ALSA hda seems to only change PCI power management states
> > > of the sound devices on suspend/resume. Is there a reason the device
> > > cannot be automatically suspended when nobody has sound opened?
> >
> > I made once the automatic power-control patch for hd-audio, but it was
> > possibly racy and a bit messy implementation, so I abandoned it.
> > Since then, no one has worked on this issue.
>
> IIRC that patch saved .3W, which is quite significant -- about half of
> spinning harddrive. I'd say it is worth the effort.

OK, then I'll take a look again (and try reimplementing a bit better :)

thanks,

Takashi