For everyone to try, if you boot with "break=bottom" (maybe remove "splash" and "quiet" while you're at it), you get a command line shell. You can then edit xorg.conf with: chroot /root nano /etc/X11/xorg.conf After saving and quitting the editor, you can type "exit" (or ctrl-D) to let the boot continue and X start. This way you can disable options or change driver. If you set the driver to "vesa" it should be equivalent to Safe Graphics Mode.
Do the locked-up machines react to sysrq combinations? Christian, maybe you can check this? If so, please try to get a kernel trace. https://help.ubuntu.com/community/DebuggingSystemCrash -- [edgy][regression][rv280] black screen and console freeze when X starts https://launchpad.net/bugs/67487 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
