If the above title shocks you, you're not alone. I'm still reeling from the fact that I was able to get a dual-monitor xorg.conf with almost no effort. Here's the steps:
- Check your ATI hardware specs.
lspci | grep VGA
01:00.0 VGA compatible controller: ATI Technologies Inc M56GL [Mobility FireGL V5200]
- Download the latest proprietary ATI Radeon driver from ati.amd.com.
- Quickly scan the documentation.
- Install the driver.
chmod +x ati-driver-installer-8-01-x86.x86_64.run
- Configure X.Org. In my case, I have my external 1600x1200 monitor to the right of my 1400x1050 Thinkpad T60p. Of course, in "stretch" mode, both screens must be at the same resolution.
aticonfig --dtop=horizontal --overlay-on=1 --mode2=1600x1200 \
- Restart X (I just hit CTRL-ALT-BkSp). If that breaks things, there's always CTRL-ALT-F1 to get back to a console.
- Change wallpaper from Centered to Tiled Maxpect so it's not stretched across both screens.
- Note the new K Menu entry for ATI Catalyst Control Center.