Comment 4 for bug 1001842

I can confirm this bug, but i do not believe it is pulseaudio related.

I am experiencing the exact same problems with a new install of Ubuntu 12.04 Server Edition without pulseaudio, with standard alsa sound, lightdm and xbmc eden.

I believe the problem is Kernel or AMD Drivers related.

When the TV or Monitor is turned off, i get the following log entries in kernel log:
    HDMI hot plug event: Codec=0 Pin=3 Presence_Detect=0 ELD_Valid=0
    HDMI status: Codec=0 Pin=3 Presence_Detect=0 ELD_Valid=0

When the TV is turned back on, no HDMI status is detected to turn the ELD_Valid=1, so no sound from HDMI.

Removing and re plugging the HDMI cable results in a:
    HDMI hot plug event: Codec=0 Pin=3 Presence_Detect=0 ELD_Valid=1
    HDMI status: Codec=0 Pin=3 Presence_Detect=1 ELD_Valid=1
And sounds begins flowing again.

Logging out from the XBMC session and logging back on, results in the same events being logged:
    HDMI hot plug event: Codec=0 Pin=3 Presence_Detect=0 ELD_Valid=1
    HDMI status: Codec=0 Pin=3 Presence_Detect=1 ELD_Valid=1
And sounds begins flowing again.

I was previously running the same setup with Beta 1 and didn't experience this problem.