I've got an htpc using the following:

Debian linux (testing) kernel 2.6.33.2 (stable) VDR-1.7.14 with the vdr-xine-0.9.3 output plugin Nvidia GT220 video card xine-lib-1.2 w/vdpau alsa-driver-20100307.tar.gz w/Wei's reworked nvhdmi code

I'm using an HDMI cable going from the video card to my tv, and audio is going over the cable as well. When I press mute in VDR, I see the mute icon appear but the audio is not muted. I'm not sure if this is a xine problem or alsa but I'm guessing alsa since my previous setup was all the same except I was using a different Nvidia video card, but still with vdpau, and audio/video going from DVI-OUT on the card, to a DVI->HDMI cable into my tv. Could the problem be within the alsa driver somewhere or am I barking up the wrong tree?

Thanks for any help.