Comment 18 for bug 191027

It may be a hw detection issue. I had the same problem when using Hardy Alpha 5, but not anymore with the recent updates of totem-gstreamer.

Please, give details on your hardware accordingly to https://wiki.ubuntu.com/DebuggingSoundProblems

I managed to solve this by adding:

options snd-hda-intel model=auto

To /etc/modprobe.d/alsa-base, as my hardware was detected as:

00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)