I got the patch from this bug report, just fallow the link to the freedesktop-bugs 7154 and the patch is there somewhere.
I'll attach it here too. Eli Criffield ** Attachment added: "Patch to stop the lockups" http://librarian.launchpad.net/5075450/xserver-xorg-driver-ati-6.5.7.3-patch -- [dapper] xrandr freezes the system (radeon, MergedFB) https://launchpad.net/bugs/47775 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
