Some days ago I got a new TFT: 20" with a native display resolution of 1600x1200. Finally I can work with Eclipse and see the 80 character word wrap border with Navigator window on the left and Outline window on the right. However I faced some unexpected problems until I was able to enjoy the full resolution on the secondary screen of my Compaq NW8240 running SuSE Linux 10.2.
Sax2 always proposed a resolution of 1280x1024 on the secondary screen, although I already imported the monitors information file and was sure that the monitor data was correct. I also selected 1600x1200 for the second screen and it was also updated in the xorg.conf. Also manual changes to xorg.conf didn't help until I added this line to the Device section:
Section "Device"
...
Option "PairModes" "1920x1200+1600x1200"
...
EndSection