linux-kernel - ALSA: Conexant CX20585 (thinkpad t510) speaker powersave regression

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Date:	Sat, 22 Dec 2012 14:23:24 -0700
From:	Kevin Fenzi <kevin@...ye.com>
To:	linux-kernel@...r.kernel.org
Subject: ALSA: Conexant CX20585 (thinkpad t510) speaker powersave regression

Greetings. 

I've got an issue with sound on my t510. It started in the late 3.4.x
kernels. Sound works on boot and for 5-10min after, then the speakers
stop working at all. 

I posted a while back on the alsa-users list, and someone else had the
same issue: 

http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg28769.html

It seems that the speakers(?) are getting moved to state D3 and turning
off. You can manually get it to come back for a few minutes by using
hda-verb to move it back to D0: 

hda-verb /dev/snd/hwC0D0 0x1f SET_POWER_STATE 0

http://www.alsa-project.org/db/?f=fd5ca157b2e76942df5ce2f0ae1a2817f3f08afd
is my alsa-info. 

I'd file a bug on the alsa bug tracker, but it still seems to be down
(for many months now?). No response on alsa-users, so now that I have a
bit of time, I am posting here in hopes someone can look. ;) 

Happy to provide more info or try things. 

kevin

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