Hi guys I've been lurking for a while, looking for an answer to my problem but I only got it part solved. Here comes the story:
I have an XFX DD 7950 and a LG M2380A HDTV. The GPU is plugged by HDMI to the display and I cannot have it any other way because I need it to carry audio as well.
When I first plugged the display I had the underscaling problem plus an awful pixelated view. I played with the underscaling settings but that would only get rid of the black borders and leave me with a blurry pixelated screen.
After a while I figured I had to change the pixel format from YCbCr 4:4:4 to RGB 4:4:4 (Full RGB), which would take care of both my problems.
When I started gaming I noticed that the black borders appeared again, not for every game but for some games like AC3, FC3, Hitman Absolution and HL2.
At first I thought it was an underscaling problem and I solved it by doing the registry hack to force the 0% underscaling because the games would override it with any other fix I would try. This would solve the black borders again but would leave me with the blurry pixelated picture again. This is why I believe that the game, when changing resolutions, is making CCC to reset the pixel format to YCbCr 4:4:4. Does anyone here know how to prevent this? I would be golden if someone told me which registry to create inside regedit as to change the default pixel format to RGB 4:4:4 Full.
Thanks guys. If I missed any details, please let me know.
i had problems with plugging my amd card into my lg television, it ended up being that you need to make sure to set the LG telly to Just scan for scaling and set the computer to 1920x1080 and it should work fine and fill the screen properly with all other options on default.
if it does not then you need to check the overscan options in catalyst control centre in the HDTV options and reduce the overscan area to zero.
the horrid pixelated view can also be caused by the tellys picture processing, make sure to disable all picture processing like deinterlacing and artifact reduction on the hdmi input your using for your pc.