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".
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".