Solution 1:
Run this command in terminal : alsamixer
and check if the master-sound is set to mute. (oo is unmute and mm is mute)
12.04 No Audio from HDMI After Switching Monitor Off / On
Solution 1:
Run this command in terminal : alsamixer
and check if the master-sound is set to mute. (oo is unmute and mm is mute)