Comment 22 for bug 279478

I also added "options snd-hda-intel model=3stack" to the bottom of /etc/modprobe.d/alsa-base.conf and the problem was fixed.

Link generated by alsa-info.sh before I have added that new line:

http://www.alsa-project.org/db/?f=12490beb76d4796e72a24cb6f5665839d62d773a

My computer is a Dell Dimension C521.