Have you seen this existing bug?
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/272321

If you're unable to set the PCM volume at all, see related bug
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/315971

If this fixes the problem for you perhaps this bug should be updated to
point to the PCM one so users can report that it has affected them and
ensure the correct priority is assigned.

Please do update the thread to confirm whether this works for you, or
the bug report may be closed while an issue remains!

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CRITICAL ERROR: Since update, Ubuntu 8.10 plays no sound (MacBook Pro)
https://bugs.launchpad.net/bugs/328030
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