[alsa-devel] No speaker output with kernel 3.15 and later

[steve at snewbury.org.uk]

On Tue Jul 01 2014 12:54:49 GMT+0100 (BST), Takashi Iwai wrote:
> 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.
> 
Will do.
-- 
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