SAPPHIRE Vapor-X 100282-2GVXSR Radeon HD 5850 (2 GB)
AMD Catalyst Driver Version, and Driver History
Currently running Catalyst 12.9 beta; have previously tested on 12.8.
Fully up-to-date Windows 7 x64
Display Device(s) and Connection(s) Used
Viewsonic VX2835wm, connected directly via HDMI
So... the problem. When I connect my system to my Viewsonic VX2835wm (a 28" monitor/HDTV, with 1920x1200 resolution) via HDMI, it successfully recognizes the maximum resolution and renders appropriately - except for horrendous overscan. Significant portions of the edge of the screen are completely cut off, text & images are blurry (as expected), and so on and so forth.
Said overscan also continues at lower resolution - but at lower resolution (1680x1050, specifically), CCC will let me turn on GPU scaling and switch to centered timings. The image isn't perfect, but it's acceptable.
I understand that this monitor/TV is somewhat infamous for having this sort of problem. (I obviously didn't know that when I bought it.) But let's put that aside for a moment...
Of course, the way to fix this is usually to use the GPU scaling options, and move the slider away from Overscan and towards Underscan until it works. Problem? The slider is ALWAYS disabled. No markings above or below, and it doesn't respond to mouse interactions. This persists whether I'm at 1920x1200 full resolution, or whether I'm at 1680x1050 with GPU scaling and centered timings turned on.
There are established ways to fix this overscan with an nVidia card, by overriding the EDID (http://alastair.d-silva.org/viewsonic-vx2835wm-nvidia-card-under-windows-7-dvi-hdmi-cable)... but I can't find any way to fix it for my AMD card!
Any thoughts? Either as to how to enable the Scaling Options Overscan/Underscan slider, or on how to fix the overscan in the first place?
Applications and Games
Windows, and all games
Intel Core i7-860 2.8 GHz Quad-Core, no overclocking
System Memory Type & Amount
G.SKILL 2x2GB DDR3 1600 (F3-12800CL9D-4GBNQ)
EDIT: Fixing a link format