[Bug 55984] [ilk regression] gpu hangs on ironlake with 3.6 + -next + -fixes code

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55984

--- Comment #141 from Chris Wilson <chris at chris-wilson.co.uk> ---
Created attachment 73082
  --> https://bugs.freedesktop.org/attachment.cgi?id=73082&action=edit
Drop caches

I can reproduce this using the attached patch and UXA on ilk:

$ while sleep .5; do echo 15 > /sys/kernel/debug/dri/0/i915_gem_drop_caches ;
done &
$ DISPLAY=:0 CAIRO_TEST_TARGET=xlib ./cairo-perf-trace -i6
cairo-traces/benchmark/firefox-fishtank.trace

Dies in mere seconds.

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