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".

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No sound (any) since upgrading to 8.10 (and nothing is muted!)
https://bugs.launchpad.net/bugs/304205
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