MPEG 2 Audio and 5.1/7.1 Speaker configuration not working over HDMI

Hi all,

I wonder if this is a bug or a configuration problem.

I have a 7.1 HDMI receiver connected to a Mac Mini over HDMI. I noticed that movies with 2.0 Stereo MPEG 2 (MP2) sound only play over my receiver if I specifically select a 2.0 speaker setup. If I choose a 5.1 or 7.1 setup - I get no sound, although my receiver show PCM 48KHz.

Any ideas?

Thanks,
Cheers,
CJ