As of 6.6.2-0ubuntu3, I no longer need these options, and with UseFBDev set to False, the machine doesn't hang.
I'm now happily back to using the generated configs. =) ** Changed in: xserver-xorg-video-ati (Ubuntu) Status: Unconfirmed => Fix Released -- On PPC64 update to 6.6.1 causes machine to hang https://launchpad.net/bugs/54352 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs