Comment 18 for bug 301261

I now have the same issue, Updated from 8.10 ( sound working ) to 9.04. All packages are latest.

Alsa mixer shows the channels are 100.

Under sound preferences I have no sound from any Test, and when I click volume control from the panel, device is listed as "Playback: Null output (Pulse Audio Mixer)"

Rebooting, unloading / reloading Alsa has made no difference.

I do not believe this is a duplicate of bug 299093. That bug was specific to alsa mixer sound levels resetting to 0, which this does not seem to be the case. I am no expert, so please ask what information you would like me to post for you