This is possibly https://bugs.freedesktop.org/show_bug.cgi?id=29834
which is fixed upstream in kernel 2.6.35.8. From the changelog:
commit 0097ad30cacd143b61ae58f0e9830ae8be3c6c79
Author: Alex Deucher
Date: Mon Sep 27 10:57:10 2010 -0400
drm/radeon/kms: fix potential segfault in r600_ioctl_wait_idle
commit e488459a0e131acc9e14df093cfee740bc431953 upstream.
radeon_gem_wait_idle_ioctl can apparently get called prior to
the vram page being set up or even if accel if false, so make
sure it's valid before using it.
Should fix:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=597636
https://bugs.freedesktop.org/show_bug.cgi?id=29834
Signed-off-by: Alex Deucher
Signed-off-by: Dave Airlie
Signed-off-by: Greg Kroah-Hartman
A PPA of this kernel is available at http://kernel.ubuntu.com/~kernel-
ppa/mainline/
** Bug watch added: freedesktop.org Bugzilla #29834
http://bugs.freedesktop.org/show_bug.cgi?id=29834
** Bug watch added: Debian Bug tracker #597636
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=597636
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Kubuntu 10.04 RC xserver-xorg crashes during startup live session
https://bugs.launchpad.net/bugs/569008
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