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#11
Computer detecting tv's audio capabilities most likely culprit
I have a similar setup... desktop, hooked to a SONY STR-DH520 receiver, passed through to an HDTV. I was only being given the option for 2.0 audio, but when I went into the receiver's settings, under the hdmi menu, under audio out, I changed the setting to AMP only. At that point Windows offered me a plethora of audio options, and I have been able to tune the system almost perfectly.
Hope this helps!