linux-kernel - Re: 2.6.29 regression: left audio channel broken after resume from suspend with Intel HDA

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Date:	Tue, 28 Apr 2009 07:24:33 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Tino Keitel <tino.keitel@....de>
Cc:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: 2.6.29 regression: left audio channel broken after resume from	suspend with Intel HDA

At Tue, 28 Apr 2009 02:23:09 +0200,
Tino Keitel wrote:
> 
> On Fri, Apr 24, 2009 at 16:41:14 +0200, Takashi Iwai wrote:
> > At Fri, 24 Apr 2009 16:21:13 +0200,
> > Tino Keitel wrote:
> > > 
> > > On Fri, Apr 24, 2009 at 16:01:40 +0200, Takashi Iwai wrote:
> > > 
> > > [...]
> > > 
> > > > The codec communication looks a bit unstable on this device...
> > > > Does this still happen on the latest 2.6.30 version?
> > > 
> > > Yes, at least with 2.6.30-rc3. I reloaded snd-hda-intel a few times,
> > > and at some point /etc/init.d/alsa-utils start complained, I guess
> > > because some index numbers in  the mixer changed.
> > 
> > And this happens because the codec doesn't respond properly any more.
> > So, something triggers to screw up the communication with the codec.
> > I have no idea right now.  Possibly you can bisect the changes against
> > sound/pci/hda/patch_sigmatel.c...
> 
> The problem is that I don't have a reliable way to trigger this bug. It
> just happens sometimes.

That's what I'm afraid of.

> I just saw another, major problem: line in doesn't work anymore with
> 2.6.29 and also 2.6.30-rc3 (no usable input level). It works with
> 2.6.27.20.

This could be rather a mixer setup issue.
Please give alsa-info for the same setting on both kernels.


Takashi
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