How to debug drm/kernel on system freeze

Frederik Vogelsang frederik.vogelsang at
Sat Jun 11 09:47:46 PDT 2011


sorry for the late reply, but I was testing various options intensively.

2011/5/3 Michel Dänzer <michel at>:
> *If* the kernel produes any more output, you might get at it with a
> serial console or netconsole.
netconsole is what I was looking for - thanks. But unfortunately the
kernel does not print *any* output when the system freezes. No stack
trace, nothing (not even with DRM debug).

2011/5/3 Alex Deucher <alexdeucher at>:
> The problem with with a lot of lockups is that they don't produce any
> special output.
Yeah, I noticed that :(

> It would help to pinpoint what module is causing the problem.  Try setting:
> Option "NoAccel" "True"
This option works.

> Next you can try removing that option and disabling EXA composite:
> Option "EXANoComposite" "true"
With EXANoComposite=true I also did not get any freezes at all. I've
testet this for a long time (one month) and it worked (with both r300c
and r300g).

As soon as I remove the "EXANoComposite" option I am getting these
freezes again (with r300c, 300g, plain gallium software rasterizer,
llvm software rasterizer and mesa software rasterizer).

Any ideas or patches I could try?


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