Just adding that I am using the latest Dapper: xserver-xorg-driver-ati 1:6.5.7.3-0ubuntu7 (dapper)
-- [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
