Arthur, I am not convinced you have the exact same bug. You did not answer the question if you are sure your problem is due to the AGP speed setting.
-- [regression][rv280] black screen and console freeze when X starts - drm lockup https://launchpad.net/bugs/67487 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
