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[Dweia <727620@xxxxxxxxxxxxxxxxxx>]

Bryce Harrington wrote on 2011-03-04:[...] That suggests a regression in
the kernel between 2.6.38-3 and -4

The error must have occured a lot earlier. I tried a bunch of different
kernels, each with the (at the moment) most recent version (highest
number after the dash):

2.6.35-25 - works
2.6.36-1 - works
2.6.37-12 - crashes most of the time
2.6.38-7 - crashes most of the time

I also tried some other versions, including the mentioned 2.6.38-3, but
no luck there for me.

There's another bug, which may or may not be related, and which got
apparently fixed with kernel 2.6.37, maybe thereby introducing this
problem with the crashes? This older problem causes entries like the
following in the kernel log when shutting down or rebooting the system.

kernel: [   36.068256] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
kernel: [   36.068719] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CF42 (len 72, WS 0, PS 0) @ 0xCF71
kernel: [   41.070113] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
kernel: [   41.070654] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CB20 (len 62, WS 0, PS 0) @ 0xCB3C
kernel: [   46.271694] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
kernel: [   46.272333] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CB20 (len 62, WS 0, PS 0) @ 0xCB3C

These entries occur only in kernel 2.6.35 once per second, in 2.6.36
every 5 seconds and disappear altogether in 2.6.37

P.S. I don't think the bug has to do with xserver-xorg at all - it's
most probably the radeon kernel-module, since the errors occur long
before X is starting. Also the bugs go away when I blacklist the radeon
module. Unfortunately I cannot switch off the Radeon-graphics card, when
the module for it isn't loaded. :-(

-- 
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https://bugs.launchpad.net/bugs/727620

Title:
  [Radeon HD 5650 and 5470] Driver crash during recovery boot and in
  normal boot (Regression from 2.6.38-3 to -4)