[ubuntu-x] Intel GPU hangs and batchbuffer dumps

[Bryce Harrington]

CCing jbarnes who is the guru on this.   Hopefully he can shed some
light.

Bryce

On Thu, Feb 18, 2010 at 10:21:14PM +0100, Geir Ove Myhr wrote:
> Hi xorgers,
> 
> We used to ask for batchbuffer dumps for GPU hang bugs (freezes) on
> intel in order to help upstream figure out the cause. It turns out
> that these are currently not useful for upstream anymore with Lucid,
> since kernel 2.6.32 automatically resets the GPU after a hang is
> detected. Chris Wilson has an experimental kernel patch [1] that will
> save the state of the batchbuffer to
> /sys/kernel/debug/dri/.../i915_error_state [2]. I have tried to
> compile 2.6.33-rc8 with the patch, but after following the
> instructions on [3] the kernel doesn't boot with my Lucid. Would it be
> possible for someone with more kernel knowledge than me to build a
> recent kernel with the patch and put it in a semi-official place so
> that we can ask people with freeze bugs to record the batchbuffer with
> that kernel?
> 
> I have updated https://wiki.ubuntu.com/X/Troubleshooting/Freeze to
> reflect the situation.
> 
> Btw, does anybody know more about how the GPU resetting works? What
> happens after a GPU hang is detected and the GPU is reset? Does xorg
> need to be restarted or should it in theory recover automatically?
> 
> [1]: http://lists.freedesktop.org/archives/intel-gfx/2010-February/005894.html
> [2]: http://lists.freedesktop.org/archives/intel-gfx/2010-February/005810.html
> [3]: https://wiki.ubuntu.com/KernelTeam/GitKernelBuild
> 
> Geir Ove
> 
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