Here is the XF86Config file for the 46.20 driver
on my Inspiron 8600/GeForce 5200Go/WXGA LCD
This tarball also contains a XF86Config that uses
the vesa driver, which I had to use until I
got the 46.20 driver going.
The file is a gzipped tar file, but I had to
use the .zip extension because this board
has some (rather odd) demands for file extensions.