[Mesa-dev] Sandy Bridge heisenbug

Chris Wilson chris at chris-wilson.co.uk
Thu Mar 31 15:20:01 PDT 2011

On Thu, 31 Mar 2011 17:08:05 -0500, Ian Pilcher <arequipeno at gmail.com> wrote:
> Unfortunately, that patch appears to already be in the latest Fedora
> kernel, kernel-, and I still get the hangs with
> the latest Mesa packages.  (No hangs with 7.10, though.)

Bah, foiled again.

You can try 'echo 1 | sudo tee /sys/kernel/debug/dri/0/i915_wedged'
to grab an i915_error_state. It may or may not actually wedge the
machine. Caveat tester.

However, if you are reasonably confident that a change in mesa provokes
the issue, you can bisect the commit in question. That may give another
clue as to where to look next.

Chris Wilson, Intel Open Source Technology Centre

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