7.1 over HDMI using GTX 670

[S_meister]

Hello, I got my home theater setup but the computer is not delivering 7.1 via HDMI.

Here is my computer setup:
GA-Z68XP-UD3 motherboard
16GB RAM
GTX 670 graphics card
i7 core 2700k processor
Windows 7 OS

I have an HDMI cable running from the GTX 670 to my Onkyo NR-3010 receiver. On that receiver, I have 11.4 surround sound setup with a total of 15 speakers. I downloaded a 7.1 test WAV fileand played it through VLC media player (it allows me to select my playback format) and even in THX cinema mode using 11.4 setup, I was still getting the stereo image over HDMI. I went ahead and used optical coming from my motherboard and I managed to get 7.1, however, my surround and rear surround speakers were inverted and I don't see any setting on the computer of how to change that. I have reinstalled my drivers, tried different HDMI ports on the receiver, used different cables, and I'm still not getting the 7.1 over HDMI.
When I go to my playback devices, I see my HDMI port and it is labeled as TX-NR3010-1 so I know it recognizes the receiver. However, when I go to properties, it says the max channels are 2 and when I go to configure, the only mode I have available is stereo.
As for the optical connection, in playback devices it is listed as "Realtek Digital Output (optical)" and does not give me the configure option, just properties. Under properties in the advanced tab, the default format only goes up to "Dolby Digital Live (5.1 Surround)".
This is completely unacceptable for me as I got the audio system solely for the computer as my movie player and game console and I set my self back at least 5 grand with it.
Any help will be much appreciated.

 

[Nanaea]

Hi, I have tested with several computers with my HT and each computer seems to have it's own way to get it done however i have found that AC3 filter tends to get things working. You can get it from this link. After installing it just config it to work on 7.1.

By the way I have my connection going through spif and ac3 uses it properly.

I did a quick research and i think when set to spif ac3 filter doesn't decode the audio tracks and sends them pure to the avr letting it decode the audio track so maybe this solution will work even better.