This works for me on HP Compaq nc6400 (radeon mobility x1300) with a vanilla ubuntu 12.10 install:
1. edit grub command line to add 'nomodeset' and boot.
2. Then add 'nomodeset' in GRUB2's kernel command line (using GRUB_CMDLINE_LINUX in /etc/default/grub) and run 'sudo update-grub'
3. Add the following to /etc/rc.d/rc.local: modprobe -r radeon modprobe -r drm modprobe radeon modeset=1
4. Remove ~/.Xauthority
5. Reboot
And the problem is solved.
This works for me on HP Compaq nc6400 (radeon mobility x1300) with a vanilla ubuntu 12.10 install:
1. edit grub command line to add 'nomodeset' and boot.
2. Then add 'nomodeset' in GRUB2's kernel command line (using GRUB_CMDLINE_LINUX in /etc/default/grub) and run 'sudo update-grub'
3. Add the following to /etc/rc.d/rc.local:
modprobe -r radeon
modprobe -r drm
modprobe radeon modeset=1
4. Remove ~/.Xauthority
5. Reboot
And the problem is solved.