Re: no audio through HDMI in Linux
I had the same problem and the 256.xx beta driver fixed things for me as well as upgrading to ALSA 1.0.23. I'm not saying that will fix it, but it's probably worth a try. I also had to turn on the cryptic looking 'SPDIF 1' output in alsamixer (turns out that is actually the HDMI interface.) Hope that helps!