[Bug 96743] [BYT, HSW, SKL, BXT, KBL] GPU hangs with GfxBench 4.0 CarChase

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96743

--- Comment #12 from Eero Tamminen <eero.t.tamminen at intel.com> ---
Did a clean boot with few days old 3D stack on BXT, and ran CarChase offscreen
20x times to see whether this test alone is still able to trigger GPU hang.  ->
Performance was OK for all the rounds, but there was GPU hang from the test.

I.e. this test alone is sufficient to trigger the hang, it doesn't require
running anything else, even on BXT.

(Topi's using GT2, so can't test that right now, but hangs should be even
easier to trigger on that.)

It's possible that getting perf drop from the hang would require running also
other test-cases, as I didn't see that.

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