Have you tried killing pulseaudio, and attempting to get sound output?
** Package changed: alsa-driver (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Ubuntu Audio Team (ubuntu-audio)
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no sound - hda intel
https://bugs.launchpad.net/bugs/352577
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