Originally Posted by berck
Just using the nvidia driver (from 6xxx to 7174) produces these vertical lines along the right side of the screen. It also removes some of the pixels at the bottom replaces them with a reflection of the top part of the screen. The xorg.0 file says it can't produce 1600x1200 resolution so it uses 1400 x 1050 instead. Ignoreing EDID and using nv's supported settings gets rid of the vertical lines on the right, but produces two squashed images (1600x600 and repeated at the lower half with 1600x600).
Try this "Monitor" section and tell me if that helps any:
Identifier "Dell 8200"
DisplaySize 300 230
Modeline "1600x1200" 162.00 1600 1664 1856 2160 1200 1201 1204 1250
Be sure to change the "Identifier" to whatever you're using as a monitor identifier in your "Screen" section, as well.