[workaround and cause]
if you delete the file '/var/lib/alsa/asound.state' and reboot, the alsa
driver is properly loaded. then, you can tweak the mixer settings to
get sound (for me, i have to enable surround sound).
however, the next time you reboot, the sound goes away again and you
have to repeat the process.
thus, i believe the problem lies with the alsa startup script. if the
file '/var/lib/alsa/asound.state' exists at boot, alsa tries to load it
but gets confused and alsa doesn't properly configure. maybe the file
isn't properly formatted; i know it refers to controls that don't exist
on my card.
$ lspci | grep -i audio
00:14.2 Audio device: ATI Technologies Inc SB450 HDA Audio (rev 01)
** Changed in: linux-source-2.6.17 (Ubuntu)
Status: Needs Info => Confirmed
--
sound (ALC880) does not work in edgy
https://launchpad.net/bugs/77828
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