The issue is gone in linux-image-2.6.35-23-generic version 2.6.35-23.40.
Thanks!
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BUG: unable to handle kernel paging request at c90001c0 -
r600_ioctl_wait_idle+0x43
https://bugs.launchpad.net/bugs/657479
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There is a similar defect with patch for Lucid, I believe:
http://osdir.com/ml/kernel-team/2010-10/msg00106.html
Please prioritize this bug higher as it makes my Radeon/AGP desktop system
unusable (console is broken, unable to use X server).
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BUG: unable to handle kernel paging request at fff