AVS Special Member
Join Date: Mar 2003
Location: Calgary, Alberta, Canada
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Which driver are you using?
Also, I occasionally run into this issue - usually after the PC wakes from suspend/sleep. Most of the time windows won't even see an audio device, but once in a while it'll only see it as a stereo device. The only real solution for me is to reboot, but 50% of the time I can get everything back if I 1) switch AVR input _away_ from the PC input, wait several seconds, then switch back, 2) do a rigorous display detection, 3) change the resolution to something else, then back again.
It's a pain in the but - but I haven't done an EDID override yet - I need to read up on how to do that!