[Bug 67243] [ILK]igt/kms_render/gpu-blit randomly causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67243

--- Comment #24 from Imre Deak <imre.deak at gmail.com> ---
(In reply to comment #23)
> Created attachment 85305 [details]
> dmesg with patch comment 21

Ok, thanks a lot for testing these. I didn't get much closer to the root cause
but at least we eliminated some possible causes. To summarize, a loop as in
comment 17 is enough to trigger the problem and the hang seems to happen in
intel_disable_plane().

The wrong ilk disable sequence I mentioned is only a red-herring, since the
port gets only disabled in encoder->post_disable(), so we can forget about
that.

One more pattern I noticed in your dmesg is regular fifo underflows, that
happen consistently with certain modes, resulting in lower watermark
thresholds. And the hang happened in all cases with the same threshold values.
Atm, no idea why you get those, I don't get any underflows on my ilk even with
your timings.

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