According to my tests, the suggested commit really fixes the problem, so I would suggest to include that patch within natty's kernel too:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=patch;h=97ea530f6fac1f9632b0c4792a2a56411454adbe -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in Ubuntu. https://bugs.launchpad.net/bugs/735126 Title: [natty] system freezes on boot without disabling KMS _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp