Thanks for the quick response. I added "1280x800" to the screens section of /var/xorg.conf and restarted X, but the Gnome display manager does not display it as an option.
I know that when I pass bad vga= values to the boot parameters, the max resolution offered as an option is 1024x768. I know Windows can run 1280x800 on this machine, so I'm guessing the drivers are the issue? Would the RC release have a better chance of working?
I'd really like to use Plop for my little PXE boot project, but the screen resolution is a show stopper. Thanks for any help you can give.