Correct, it's now muted. Now you need to try different settings of the 'IEC958 Playback AC97-SPSA' element, e.g., amixer set 'IEC958 Playback AC97-SPSA' 1 or amixer set 'IEC958 Playback AC97-SPSA' 2 or amixer set 'IEC958 Playback AC97-SPSA' 3 -- no sound at all. Even unmuted https://launchpad.net/bugs/58339