that's because radeonhd doesn't support kernel modesetting and never will. You need to add "nomodeset" to the kernel options in grub. The right thing to do though is to ditch radeonhd for good, -ati has supported the same devices for some time now, and is the default anyway.
** Changed in: xserver-xorg-video-radeonhd (Ubuntu) Status: Incomplete => Invalid -- Lucid: Using radeonhd with a RV730XT card gives nothing but a blank screen https://bugs.launchpad.net/bugs/527922 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-radeonhd in ubuntu. _______________________________________________ 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