[Bug 33912] [RV515] Kernel .35 onwards, Random X freezes while scrolling

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https://bugzilla.kernel.org/show_bug.cgi?id=33912





--- Comment #11 from Alex Deucher <alexdeucher@gmail.com>  2011-06-10 15:10:39 ---
(In reply to comment #10)
> (In reply to comment #9)
> > Can you bisect?
> 
> I have never bisected a kernel, but I can try. Just have a few doubts.
> 
> 1 * Can I do with the Ubuntu kernel as per Ubuntu instructions[0] as:
> $ git bisect start Ubuntu-2.6.35-1.1 Ubuntu-2.6.34-5.14
> 
> Which seems a saner incremental interval of Jun5 -> Jun 4.

That should be fine.  The closest two kernels that where which have and don't
have the problem are your best bet.

> 2 * Are there any pointers to narrow down the kernel commit from the backtraces
> I have posted?
> Or is just looking for "drivers/gpu/drm/radeon/" the closest?

You can narrow the bisection to just radeon, but if the problem is something
non-radeon you'll get inconclusive results.

> 
> 3 * Is there any specific command I need to run if I hit the bug? 
> Or is gdb of X sufficient? 
> Do I need to set any variables to get better logs of the freeze?

It's really hard to narrow down what causes the GPU to hang.  It could be a bug
in the kernel, it could also be a certain combination of command buffers or
userspace acceleration drivers that happen to make the GPU angry.  Just getting
the commit id should be enough.  You might also try a newer ddx and/or mesa 3D
driver to see if that helps.

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