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  1. Bug #1029790
  2. Comment #21

Comment 21 for bug 1029790

Revision history for this message
Paul (i41bktob-launchpad-net) wrote : Re: Can't boot without nomodeset option-kernel 3.5.X.X/3.6.X.X ATI M52 [Mobility Radeon X1300]

Thanks for pointing out this policy. I did however want to share my workaround with people who might find this bug. And surely you'll agree that having one's bug report marked as a duplicate feels like it is being thrown away, it's not a good feeling for the reporter; and in this case it is clear that we're dealing with a duplicate.

By the way, I performed the bisection, using quantal kernels from http://kernel.ubuntu.com/~kernel-ppa/mainline/

3.4.17 (2012-10-31) works, as reported earlier, while 3.5.0-rc1 (2012-06-03) crashes (screen and keyboard frozen, no log files left). Further bisection would require delving into the git history. Newer kernels are also affected, right up to the latest 3.7.0-rc4 (2012-11-04). So the signs point to a problem upstream.

Red Hat users have hit the same issue, and have got further than we in debugging. Timothy Davis narrowed the problem down to changes made in radeon_kms.c between 3.4 and 3.5. Again, we need to send this upstream.
 https://bugzilla.redhat.com/show_bug.cgi?id=845745