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 XFCE, my htpc runs 64-bit Linux Mint Xfce, my secondary htpc runs 64-bit Xubuntu, my answering machine runs 64-bit windows 7, my laptop runs 64-bit Xubuntu.