I am using the drivers supplied by Asus, for my HD 3200. I am not currently using the HD capabilities. My Set is an older 42" Projection. I have ordered a DVI-D to Component cable to hook up to the TV. I am currently using the VGA output into a VGA to TV converter, and running at 800x600 UI2 masked.
I know its not the latest and greatest driver for the ATI card, but Asus provided it, and I learned from getting my Realtek Gigabit NIC working using the Asus provided drivers, that sometimes older is better.
Go to their website or copy over the file from your support DVD, and use those drivers, you'll save yourself many hours
p.s. As Asus seems to always provide Linux Drivers with their boards, going forward, I think I will be using their product exclusively.
Just My 2 Pennies.