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

[Takashi Iwai]

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


Takashi