To help pinpoint whether this is a driver regression, please try
model=ref:
sudo /sbin/alsa force-unload && sudo modprobe snd-hda-intel model=ref &&
speaker-test -c2 -Dplug:front
** Changed in: pulseaudio (Ubuntu)
Status: New => Incomplete
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No sound after upgrade from Jaunty to Karmic
https://bugs.launchpad.net/bugs/400682
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