This sounds like a problem with alsa-utils. What happens when you run, from konsole:
$ sudo /etc/init.d/alsa-utils restart
** Changed in: Ubuntu
Sourcepackagename: None => alsa-utils
Assignee: (unassigned) => Simon Law
Status: Unconfirmed => Needs Info
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sound: PCM channel is always off after reboot or after suspend
https://launchpad.net/bugs/84038
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