From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: No speaker output with kernel 3.15 and later
Date: Tue, 01 Jul 2014 13:54:49 +0200
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To: Steven Newbury <steve@snewbury.org.uk>
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At Tue, 01 Jul 2014 12:49:32 +0100,
Steven Newbury wrote:
> 
> On Mon, 2014-06-30 at 11:24 +0200, Takashi Iwai wrote:
> > At Sun, 29 Jun 2014 15:09:56 +0100,
> > Steven Newbury wrote:
> > >  I sent 
> > > Takashi an email mentioning this regression a month ago, and
> > >  it's 
> > > taken me this long to send this email... :-$
> > >  Since updating to 
> > > kernel versions >=3.15 I've had no audio from my
> > >  laptop speakers.  
> > > Earlier versions worked fine.
> > >  It's a CLEVO W270EUQ laptop.  The 
> > > output mixer device is showing up,
> > >  but no sound comes out at any 
> > > volume level.
> > >  As requested I've attached compressed alsa-info.sh 
> > > output for both the
> > >  working and non-working cases.
> > >  I'm perfectly 
> > > willing to test patches etc.
> >  
> > Hm, I see no significant difference between 3.14 and 3.15 alsa-info.sh
> > outputs, and there's been very little change for VIA codecs between
> > these versions.  So, in short, I have no idea what went wrong.
> >  
> > Could you double-check whether it's really a kernel issue?
> > That is, switch between 3.14 and 3.15 and confirm the problem happens
> > only with 3.15.  Also, for testing the sound, try like
> >  
> >         % aplay -Dplughw -vv foo.wav
> > 
> Checked again.
> 
> 3.16-rc2: silence
> 3.14.3: works fine

Then I'd suggest to bisect between 3.14 and 3.15.


Takashi