AVS Special Member
Join Date: Apr 2008
Location: In my imagination!
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Is pass-through turned OFF in the AVR? Pass-through is used to send the signal from the source to the TV even if the AVR is OFF.
If pass-through is ON, then the HTPC will see the two TV speakers and will not allow you to set more than two speakers.
Make sure you have the AMD HDMI driver selected during installation.
After installation, configure AMD HDMI Audio Device and see if you can set 7.1 speakers.