Comment 30 for bug 1029790

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Arun T. Anandhakrishnan (arun-ta) wrote : Re: Can't boot without nomodeset option-kernel 3.5.X.X/3.6.X.X ATI M52 [Mobility Radeon X1300]

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.