From: Pavel Machek <pavel@ucw.cz>
To: Takashi Iwai <tiwai@suse.de>
Cc: linux-pm@lists.linux-foundation.org, Andi Kleen <ak@suse.de>,
perex@suse.cz
Subject: Re: Re: power management in alsa
Date: Wed, 25 Jul 2007 18:41:50 +0000 [thread overview]
Message-ID: <20070725184149.GA10173@ucw.cz> (raw)
In-Reply-To: <s5hejiwwsfn.wl%tiwai@suse.de>
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.
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2007-07-25 18:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-25 12:36 power management in alsa Andi Kleen
2007-07-25 12:58 ` Takashi Iwai
2007-07-25 18:41 ` Pavel Machek [this message]
2007-07-26 10:04 ` Takashi Iwai
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