For my Latitude D630, I was stuck in 1024x768 or less with the vesa driver.
To fix it I ONLY needed to do 1 thing.
to the /etc/grub.conf
(which is really /boot/grub/grub.conf
the kernel line looked like
kernel /vmlinuz-126.96.36.199-26.rc1.fc15.i686.PAE ro root=/dev/sda1 .....
I must now get networking to work
I originally also made an xorg.conf, but that turned out to be unnecessary
1. Created /etc/X11/xorg.conf