I have sound working over HDMI on a board with a RealTek ALC888 and a Intel chipset wich reports the codec to be Chrontel HDMI.
I have tried making the HDMI sound work on a Aliza sound chipset and ATI card ( ATI X1200 with the MAY release of ATI  and RealTek ).

When I try to make the sound work on my HDMI out with speaker-test, I dont get any errors, just no sound ..... I never tried on an Nvidia board that why I suggested to try to post on NVidia forums, but since the HDMI sound needs to work with the Video Card AND the sound card, if the drivers from NVIDIA a not good, no sound.

I also read on a few posts in different forums that the HDMI sound works on the HD series of cards from ATI but I had no experiences with these cards.

Good Luck  ! and if you get the sounds working, be sure to post your progress.

Phil.

On Fri, May 30, 2008 at 10:53 PM, blake <blake@www.loadedshelf.com> wrote:
On Fri, 30 May 2008 18:58:08 -0700, Lee Revell <rlrevell@joe-job.com>
wrote:

> Please  search the nvidia forums for this issue.  HDMI is not
> supported on Linux.  The behavior seems to be by design.  It reeks of
> DRM...

Just FYI, the NVidia forums have very little on Linux at all. Less than 30
messages in the past 4 years, unless I'm searching wrong.

Or did you mean a different NVidia forum from the official one?

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