You will need to configure your xorg.conf to make the display changes permanent. There is a good guide on the ubuntu site.
FWIW, I haven't had much luck with ASUS computers. But I love my Lenovo Thinkpad.
My desktop runs 64-bit Linux Mint Nadia KDE, my htpc runs 64-bit Linux Mint Nadia Xfce, my answering machine runs 32-bit windows xp, and my laptop runs 64-bit Linux Mint Nadia KDE. Each seems suited to its purpose.