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I have an Ubuntu 12.04 machine hooked up via an ATI/AMD HD 6450 card through HDMI to my Sony HDTV. I am using a recent version of the proprietary fglrx / catalyst drivers from AMD. The audio goes along the HDMI.

When I change the channel or let my computer sleep I lose audio. Logging off and then back on makes it work again.

Any ideas what is causing the audio to drop?

Any ideas as to how logging off and then logging back in restores audio?

Is it possible to do the thing that logging off and then back in does wrt to audio via a command-line command?

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The Python script mentioned in this post works for me. askubuntu.com/questions/133575/… –  user72869 Jun 24 '12 at 2:44
    
I just upgraded the graphics driver to the beta version and it fixed problem. –  Andrew Tomazos Jun 24 '12 at 2:47
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According to the AMD Developer Central, its a bug. You can read more about it Here.

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