Same problem here (Phenom II 920, Gigabyte MA770-UD3, Sapphire Radeon HD 4670 Ultimate), but updating the mainboard bios didn't help. Changing from DVI to VGA output did help. DVI works with Karmic (xserver-video- ati 6.12.2).
** Changed in: xserver-xorg-video-ati (Ubuntu) Status: Fix Released => Confirmed -- radeon 4670 black screen https://bugs.launchpad.net/bugs/363547 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati 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