Yesterday I put a new graphics card into my desktop machine (a CGA-P1652 RADEON X1650PRO 512MB) . I hooked my 2 big screens on it and rebooted. My ubuntu dapper couldn’t start gdm (ffcourse). So I apt-getted the ATI drivers and did a dpkg-reconfigure xserver-org, still couldn’t boot. So I started searching, after a while I found the aticonfig tool, one word sweet. I ran it witht he option for dual screen setup and he made a template xorg.conf file.
After adding the Xinerama option and setting the resolutions, I now have a nice widescreen view of my desktop and I can drag my windows over both of them. Life is great! I really believe that multiple screens do increase performance. I also liked the fact that my dapper box now has the ability to modify my screen resolutions using the gnome tool. The last time I did the dual screen setup with ubuntu, the app crashed, guess it wasn’t ready for dual screens. Now it works like a charm!
So people out there with radeon setup problems, one tool : aticonfig