Back in June 2012 I created a Home Theatre PC, i was really happy with the setup except that when I ran the audio through the HDMI to the receiver, I had intermittent sound dropouts. Now the dropouts were literally for a second, but it was random and is really annoying.
I tried a number of things, but nothing worked. Anyway I put up with issue for a while, I had other things going on and assumed that etiher Sapphire, AMD or Onkyo (receiver) would fix the issue.
So after 6 months, I have now found a solution. It was in a thread on the issue I was having.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Video\{XXXX...}\0000
( 'XXXX' means device number. There are several device number folder and u should find 'AdapterDesc' in 0000 folder which key value is 'amd radeon HD 7XXX Series'. )
At that '0000' folder, Change 'PP_SclkDeepSleepDisable REG_DWORD' value 0 to 1.
I rebooted, and touch wood the problem has gone.
References are here
There was another solution that seemed to work, but needed to be done after each reboot. The above registry entry should work all the time.
http://www.overclock.net/t/1295464/intermittent-hdmi-audio-output-on-7970-12-8-drivers
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