I have searched all over, tried a number of "fixes", but no luck so far.
I have an HTPC with ASRock H77 mATX board using HDMI out to my Marantz NR1403 receiver, and HDMI from there to Samsung TV. Drivers everywhere are up to date. Sound is configured under "playback" to use the Intel Display Audio which is labeled "Marantz AVR." I disabled the other two (Speakers and Realtek Digital Output). The output is configured for 5.1. Test tones play through all speakers. I use Windows media center, and all test tones play fine in that audio setup as well. So far, so good.
When I go to the receiver, I see the PCM and DIG lights on and status
However, I only get stereo output on the speakers--no surrounds and no sub regardless of what I play on media center(even those labeled DD). I must be missing a setting somewhere but I don't know where. I have been through all the AVR settings, tried the various HDMI settings there, been in the HTPC BIOS to enable all HDMI audio, etc.
Does an HTPC only output PCM? Can it bitstream DD from network TV so I get the corresponding DD lights on the AVR?
Not sure where to go next.