I also find the headphone and speaker switches turned off.
After using the Volume Control to change the PCM level to 100 (which I see reflected in alsamixer) and turn on the speaker switch, I get sound, as verified by playing a movie through totem and with VMware using oss-compat to provide /dev/dsp.
Matteo,
Thank you for the help. Here is what I have found. After a reboot, running alsamixer -c 0, and looking at [Playback]:
Master: 100 [db gain=0.00]
Headphone: off
PCM: 0<>0 [dB gain=-58.50, -58.50]
Mic: 0<>0 [dB gain=-34.50, -34.50]
Mic Boost: 0<>0
IEC958: 100 [dB gain=0.00, 0.00]
IEC958 Default PCM
IEC958 Playpack Source [PCM]
I also find the headphone and speaker switches turned off.
After using the Volume Control to change the PCM level to 100 (which I see reflected in alsamixer) and turn on the speaker switch, I get sound, as verified by playing a movie through totem and with VMware using oss-compat to provide /dev/dsp.