linux-kernel - Re: mmotm 2010-08-11

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Date:	Thu, 12 Aug 2010 23:11:42 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Valdis.Kletnieks@...edu, Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: mmotm 2010-08-11 - audio volume issues

At Thu, 12 Aug 2010 23:06:22 +0200,
Jiri Slaby wrote:
> 
> On 08/12/2010 08:59 PM, Valdis.Kletnieks@...edu wrote:
> > On Wed, 11 Aug 2010 16:10:49 PDT, akpm@...ux-foundation.org said:
> >> The mm-of-the-moment snapshot 2010-08-11-16-10 has been uploaded to
> >>
> >>    http://userweb.kernel.org/~akpm/mmotm/
> > 
> > Something appears to be borked in the ALSA arena.  There's no actual volume coming
> > out of the system, and 'alsamixer' is insisting that the volume slider only goes from 0
> > to 10% or so, no further.  However, experimentation shows that the volume slider
> > in 'xine' *does* affect the 'Amp-Out vals' lines, and alsamixer has *no* effect on
> > what 'Amp-Out vals' lists.
> > 
> > A diff of alsa-info.sh for the two kernels shows them being identical, so I'm only
> > attaching one copy.
> > 
> > It may be the weekend before I find time to do a bisection of this.
> 
> Didn't you (like some other people) get into the state where pulseaudio
> doesn't work? It chooses as an output a dummy driver automatically, then
> you can change volume, play sound, but actually it all goes to /dev/null.
> 
> It took me a while before I figured out that it's a "dummy" driver I
> have in pulseaudio.

Looks like there is a breakage regarding open/close due to fs/notify/*
changes.  I guess you can hear still sounds like:

	% aplay -Dplughw foo.wav


Takashi
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