Already known problem (verified by many users) :

Setup: Vista 32, ATI 4870 - Catalyst 9.2, Realtek 2.13 for ATI, HDMI Connection with a Pioneer SC-LX 90 Susano receiver and 7.1 speakers.

My main problem is that when setting powerdvd to decode multichannel audio streams to LPCM I am getting sound only from my 2 Front speakers!

Actually the output is not the stereo stream but it rather sounds like a ‘crazy’ mix of the original stream (ex. dialogues are coming only from the Front Right speaker).

With the same settings / drivers etc both PDVD 7 and 8 play fine (of course with the well known restrictions) all multi channel streams.

When checking speaker mapping from Vista everything is OK.

My receiver has 8 LEDs each one lighting up when the corresponding input channel is active and all of them light up when PDVD starts.

I also noticed that now, under Audio Settings, there is only the ‘USE HDMI’ option and not the options for ‘2-8 speakers’ (which were available in PDVD 7-8 versions and worked the same way as the ‘Use HDMI’ option in PDVD 8 (solving also btw the Rear – Side speaker mounting problems – totally different situation compared to the current one)).

I also noticed that, during playback, the Info tab shows my Sound Card ‘Realtek HDMI Multichannel Output’ but the status is ‘Not in Use’.

I re-checked / re-installed everything (also set Speaker config through Vista at 5.1) and I can only assume that the guys at Cyberlink worked their magic for one more time.

Just to add that the problem is there with all multichannel audio streams (DTS HD MA, DD TrueHD, LPCM).