Comment 25 for bug 109838

I experienced the same bug on a MSI EX600-023 with Gutsy Gibbon.
kernel :
2.6.22-14-generic
sound card :
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)

I could resolve this bug thanks to this tutorial : https://help.ubuntu.com/community/HdaIntelSoundHowto (the "Manually Specify Module Parameters" part)
Output of "cat /proc/asound/card0/codec#* | grep Codec" :
Codec: Realtek ALC888
Codec: Generic 11c1 Si3054

I added "options snd-hda-intel model=targa-dig" at the end of /etc/modprobe.d/alsa-base and now, after a reboot, the problem is gone.