Sound not working with Ubuntu 12.10 clean install
I fixed it by running alsamixer, and changing AUTO-MUTE MODE from ENABLE to DISABLE.
Fought with this problem for a while, and finally found the solution here: https://bbs.archlinux.org/viewtopic.php?pid=115808
Not really sure what it does or what other concequences it might have, but I added
blacklist i82975x_edac
to
/etc/modprobe.d/blacklist.conf
(reboot)
Sound works now and the "Dummy Output" is replaced by a real soundcard.