Comment 10 for bug 582506

@David Bensimon: Given your alsa-info output, have a look at /etc/modprobe.d/alsa-base.conf, to make sure there isn't something looking like this:

snd-hda-intel: model=3stack alias snd-card-0 snd-hda-intelgksudo gedit /etc/modprobe.d/alsa-base.conf
snd-hda-intel: model=3stack d above generic modules

...which is obviously very wrong.