I have the same laptop. nv, nouveau, and the Nvidia driver all get the display correct. 1600x1200.
Let Xorg create a default xorg.conf. As root, without X running (init 3)
Edit the created xorg.config.$ to replace the driver to which ever one you want (nv, nouveau, nvidia). If you are using the nvidia binary driver you need to also add this line -
Option "UseDisplayDevice" "DFP-0"
under the Device section. Then copy / move that file to /etc/X11/xorg.conf.