bardo wrote:
2009/1/19 David Rosenstrauch <darose@xxxxxxxxxx>:
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
