Originally Posted by kkpro
It is in the back of the manual. On HD discs, if you choose 480P, 2 channel pcm is what will be outputted (sp?). Switch to 720P or 1080i and the higher codecs will be sent via pcm. Not a firmware bug but the way it is designed, why, I'm not sure. I guess they figure that if you bought HDDVD, you are going to output higher resolutions. I think it has something to do with downconverting the digital resolution.
I've seen this reported elsewhere, including my Oppo DVD player. It seems that the HDMI spec reserves a certain % of bandwidth for audio. If you choose a lower video resolution, the total amount of bandwidth is reduced, and thus the amount of bandwidth dedicated for audio goes down. Thus, you cannot get 5.1 PCM and 480p. Whether this is a "bug" in the implementation of HDMI AV transcoders or something else I'm not sure, but it is not limited to a particular HD DVD or BD player.
Weird, but apparently true. So setting your video output higher will get you more PCM channels. However, it should work fine for 1080i. Only 480p/540p or lower would run into this limitation, AFAICT.