I have a Gigabyte HD Radeon 7950. I am using my Vizio HDTV as the display, running an HDMI cable to the GPU HDMI port. My sound works, however, it cuts on and off randomly. This happens with everything EXCEPT YouTube for some reason. Certain video games, system sounds, any other video players, etc. etc.
I'm updated to the latest CCC and drivers (My audio driver is 126.96.36.19912). I originally had the Realtek audio driver installed as well but uninstalled as I figured it was what was causing the issue, unfortunately that didn't make any improvements.