Disabling DRI didn't help -- video mode switches frequently caused crashes with rainbow-filled screens.
I haven't tried to disable both DRI and MergedFB. -- [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
