[arch-general] [signoff] kernel26 2.6.28.1-1

[David Rosenstrauch]

bardo wrote:
> 2009/1/19 David Rosenstrauch <darose at darose.net>:
>> FYI - I'm seeing a problem with the 2.6.28-3 kernel.  For some reason
>> there's no sound coming out of either the speakers or the headphones on my
>> laptop (Dell Precision M4400) after the upgrade.
>>
>> Sound module is snd-hda-intel.  I checked volume is up, mute is not on, yada
>> yada, but no sound coming out.  Problem goes away as soon as I downgrade the
>> kernel.
>>
>> Anyone else seeing this and/or have any idea what the problem might be?
> 
> Fun thing: I already upgraded the kernel when I answered your mail,
> but I hadn't rebooted. Today I did, and same thing happened :) I'm
> using snd-hda-intel too, on a 13" macbook, latest gen. My mixer is
> much thinner than with 2.6.28 (5 entries vs ~10), and there's no way
> to get some sound. Downgrading fixed. Did you find out anything?
> 
> C.

Not really.  In theory this should be a matter of doing like bardo said: 
  find out which chipset your machine uses, and then find the correct 
"model" parameter to supply for that chipset (via this page: 
http://free-electrons.com/kerneldoc/latest/sound/alsa/ALSA-Configuration.txt). 
  (Well, technically, in theory you shouldn't have to specify a model at 
all, and the module should just autodetect it.)  But that doesn't appear 
to be working, as I tried all 4 models listed for my chipset.

So I have to figure then that this is a kernel or ALSA bug, and so 
monitor the upstream bug(s) to see when it'll be fixed.  These 2 bug 
entries appear to be the relevant ones:

http://bugzilla.kernel.org/show_bug.cgi?id=12336
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4306

So might be a while before this one gets fixed.

HTH,

DR