Yes nvidia. I agree with valheru. ALSA please
On gentoo, with 2.6.8 kernel. Some how I got my rear speakers working (analog) So, no I have 4.1 sound. Using the intel 8x0 driver, since the nvsound module still hangs my system No idea what I fiddled with to get my rear speakers working. Center doesnt work, and I can control the LFE but, still, DVD's sound alot better.