Comment 9 for bug 304205

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goto (gotolaunchpad) wrote : Re: No sound (any) since upgrading to 8.10 (and nothing is muted!)

I (I am no expert) think that PCM is is muted in the screenshot you uploaded. I think the |MM| under PCM means it is muted. Select PCM and press M to unmute (maybe there must be no sound applications running in order to do that). Maybe it helps.
You could also try a "alsactl restore".