To check your 1080p display for 1:1 pixel mapping and scaling issues...try this:1080p Test Image #1
Set the image as your background (if you do this, it's important to put the background mode to "Center" or it will stretch it out even on your TV regardless to match your PC display, which is 16:10) or open it in regular old Windows Picture and Fax viewer (the default image viewer in windows) and F11 it for fullscreen.
The picture contains thousands of individual horizontal lines that should show equal spacing between them, as in all lines and spacing should be equidistant. Lines should all appear the same thickness as well as the spacing between them.
An easier test for overscan is to just move the mouse to the far edges of the screen. The mouse cursor should just stop at the edge of the screen, without so much as 1 pixel leaving the border. Also, drag a selection box on the background...each "dot" should show up as an individual pixel, they should all be spaced the same, the same size, without any funkiness.
Another test for overscan and 1:1 pixel mapping:1080p Test Image #2
In this test, do the same as you did for the first by setting it as your background with "center" mode, since it's a 1920x1080 image. Look at your TV. You should be able to see the entire circle, and out to where it says 1920x1080 on the top left. The text should appear very crisp, the boxes should all be equal, and everything in general should look correct with no funkiness. Namely the individual lines above and below the color gradient in the middle should still appear individually, with the same amount of space between them. They should not merge/disappear/look funky in the least.
BTW, I did get your PM about the a630 AMP stuck on bug. I have errands to run right now but I'll post on my original thread about it later.
Hope this helps.
PS - Setting the ATI CCC to 0% scaling (slider all the way to the right) IS the correct option. Everything should look just how it does compared to your PC monitor. This is how I run my HTPC. Believe me I am a hater of any incorrect scaling, as nothing but 0% scaling will acheive 1:1 pixel mapping. I've returned a TV because it could not display 1080p without overscan...which isn't what I consider Full-HD. Because...it was effectively still scaling (stretching!) the source whether it's from the PC, Blu-Ray, etc. Unacceptable.