I have M2N SLI Deluxe MB amd there is problem, that they don't have 5.1 via s/pdif output.
Receiver can receive only DD, DTS and PCM sound.
My MB then send only stereo sound. (via S/PDIF)
(allow: 48kHz 44.1kHz) Query for SPDIF output or higher if you think its safe for receiver. Maybe its a codec problem. I would be ok with stereo sound. Sounds like its working fine.
I tried vista x64 drivers and others but it doesn't work
I just bought a Onkyo Ht-3300 and I can't get 5.1
I love my MB Asus but the driver made from SoundMax sucks!! never again