Have you changed the name of the HDMI input to "PC", and then try the Just Scan feature? It will drop some of the processing and just show what the computer is sending.
As far as HDCP and a HDPC with a Blu-Ray drive, I can't speak on the limitations.
Gigabyte Radeon HD4670 w/ VGA, DVI nd HDMI outs. Also includes soundcard device to send audio through hdmi port.
Samsung LE32B651T 1080P LCD tv (new).
Samsung HTZ320 DVD player with built in 5.1 amplifier + speakers.
Optical from TV output to DVD player TOSLink input.
HDMI from PC to tv providing video and sound
Using HDMI everything works (sound + video) but as soon as I go over 1650x1080 in res, the telly starts shrinking the image a bit so it doesnt fill the screen and it looks poor. 1920x1080 (1080p) works, the screen displays the correct res @ 50hz on its litle pop up overlay, but it scales the displayed image down, and looks awful. Tried enabling and disabling every setting on the planet. Still have 1cm at top middle and bottom, and the image is hardware scaled down a touch. Colouration is also ruined.
Add to all of this the new blu ray drive for my media PC and you see the problem; Using a standard VGA cable it looks OK @ 1080P - not perfect - a little muddy to be honest, but it fills the TV screen and displays every pixel. Problem is that I need HDCP to work with my new blu ray drive. I tried using an adapter from the DVI port - I had the same problem as the HDMI @ 1080P, but lost HDCP support. As you will know I need HDCP to play blu-rays with PowerDVD.
Can anyone suggest how to make the samsung telly work properly with HDMI? There is no logical reason for it to be processing the signal incorrectly. This occurs whether I am playing back copyrighted (HDCP) material or not (same for gaming). I firmly believe it is the television and not the graphics card. Can anyone help; Might a firmware update help? I am a little nervous about flashing the telly without good reason.