Sound issue using GTX590 for surround sound.

righto cant seem to get anywhere with this. here's the setup, 7.1 receiver to HDTV via optical. HDTV is a Series 8 Samsung 3DPlasma. HDTV to PC Via HDMI. PC has the Auzentek HDTheatre 7.1 HDMI soundcard and a GTX590. I've been using dvi to hdmi conversion from vid card to sound card, then sound card to tv via the single HDMI cable.

now at 1st this setup was great. got all my sound nice and crisp, no issues. then now i want to start watching 3d blurays from my PC, now since the soundcard only supports HDMI 1.3a i cant get the 3D signal across. So I looked into using the vid cards audio throughput function with the and get the audio and video just from the gtx590. I thought it would just throw the raw signal across the HDMI into the HDTV/receiver to do the dolby digital decoding to produce my surround sound. However i can only seem to get a stereo signal across. Surly this can't be normal. An updated version of my soundcard with 1.4 HDMI would solve everything, but theres none out yet. An i know alot of people will just just use spdif from my soundcard to the receiver. But that means changing channel on the TV and matching it on the receiver when ever i want to change devices, and that gets annoying. And the cheaper/easier option would be to just buy a 3d bluray player.... but i like my puter  

surely i cant be the only one that wants a setup like this? lol