I'm having an issue with my Xbox 360 sending audio over HDMI. For some reason it keeps reverting back to PCM 2.0 instead of Dolby Digital 5.1. If I go into the Audio settings and change it first to stereo and then back to DD everything goes back to 5.1 as it should be.

Now I'd love to have PCM if it could output 5.1 but since it can't I would rather take the DD 5.1 bitstream.

Anyone have any idea what I can do to keep it set properly?