I am intensely irritated. I finally decided to try out the digital audio on my MBP and it seems to only be outputting stereo signals. My receiver (Panasonic SA-XR25) is configured correctly and automatically detects 5.1, DTS, etc from my DVD player, but regardless what I set DVDs to on my MBP, it is only outputting a stereo signal. I am using a proper mini to optical cable. Someone enlighten me.