I encountered this recently on my Dell Inspiron 6400, when (after updating to Precise) I checked the System Sound Settings. It only showed the Digital S/PDIF and when I played with it the sound stopped. I noticed it was only effecting my user (ie. not Guest), so I removed ~/.pulse (after backing it up of course) and restarted. Sound returned for my user account.
This workaround I believe resets the User's configuration for the Sound Setting to the default channel (Analogue output) and didn't require any global changes.
I look forward to someone addressing the real issue of why the Sound Setting doesn't show the right channels and finding a fix.
I encountered this recently on my Dell Inspiron 6400, when (after updating to Precise) I checked the System Sound Settings. It only showed the Digital S/PDIF and when I played with it the sound stopped. I noticed it was only effecting my user (ie. not Guest), so I removed ~/.pulse (after backing it up of course) and restarted. Sound returned for my user account.
This workaround I believe resets the User's configuration for the Sound Setting to the default channel (Analogue output) and didn't require any global changes.
I look forward to someone addressing the real issue of why the Sound Setting doesn't show the right channels and finding a fix.