Yeah I think 640x480 looks better than 800x480 but it's not artifact free. It depends a bit on what's on the screen. I've looked at the pixels with a loupe btw and I could not confirm my earlier suspicion that the panel is only physical 640 wide. It seems 800 wide.
I have been trying to get 800x480 working with a cartft ctf700-hs on my sony vaio with intel 945 express chipset. Using DTD I created an 800x480 resolution and added it to the registry buy when I reboot it never shows up as a resolution option.
I can't use any of the custom intel drivers people have made because they don't support laptops.
When you say it doesn't list the resolution, do you mean in the "List All Modes" area? If not, then please check there.
Oh, I didn't know you could select resolutions there.
You will find every possible resolution that your adapter will display using the current driver by going there. There may be modes that are not in the little resolution slider.
Well getting that resolution in the list and getting the screen to switch to it is a huge first step. Now you will have to tweak the DTD string.
Can you take a pic or describe the display?