Bug#626115: xserver-xorg-video-radeon: kernel crash after period of user inactivity

[Alex Deucher]

On Sun, May 8, 2011 at 7:13 PM, jamie <jm at mayfirst.org> wrote:
> Package: xserver-xorg-video-radeon
> Version: 1:6.14.1-1
> Severity: normal
>
>
> While actively working on my laptop, I experience no problems. However,
> when I am away from the machine for more than about 5 or 10 minutes, the
> screen either goes blank (still backlit, but unresponsive to keyboard
> presses) or I get a kernel dump.
>
> Below is a hand-typed representation of what I hope is the relevent
> information from the last kernel dump (subject to typos).
>
> Note - I tried and failed to manually trigger the problem by triggering
> my xscreensaver and by executing: set dpms standby|suspend|off|on etc.
>
> This problem began after upgrading to xserver-xorg-video-radeon 1:6.14.1-1
>
> Thanks for all your work!
> jamie
>
>
> invalid opcode: 0000
>
> Pid: 5107, comm: kworker/0:0 Tainted: G      C 2.6.38-2-amd64 #1 TOSHIBA Satellite T115D/Satellite T115D
>
> Call Trace:
>  kref_sub
>  ttm_bo_reserve [ttm]
>  radeon_unpin_work_func [radeon]
>  T.765 [radeon]
>  radeon_unpin_work_func [radeon]
>  process_one_work
>  worker_thread
>  worker_thread
>  worker_thread
>  kthread
>  kernel_thread_helper
>  kthread
>  kernel_thread_helper
>
> Code: ..
> RIP ttm_bo_ref_bug [ttm]
>  RSP
>

Looks like:
https://bugzilla.kernel.org/show_bug.cgi?id=32402

You can disable pageflipping as a workaround.
Option "EnablePageFlip" "False"