[Bug 87184] [BYT/BSW]igt/gem_concurrent_blit kms_flip and gem_reset_stats sporadically causes *ERROR* Timed out: waiting for Render to ack

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87184

--- Comment #6 from lu hua <huax.lu at intel.com> ---
(In reply to Rodrigo Vivi from comment #5)
> Does it also affect BDW?
Run ./kms_flip --run-subtest flip-vs-panning-vs-hang 5 cycles on BDW, it
doesn't have this error.

> What happens with ppgtt disabled?
I will give it a try.

> Why is it critical? What is customer impact here?
More than 200 cases have this error on BYT/BSW. gem_reset_stats has 53 subcases
kms_flip has 80+ subcase, gem_concurrent_blit has 108 subcases.  
And the result is unstable, It will interfere with result check and prts
bisect.
We hope we could focus on real regression and new case's fail, So disabled
these cases. If these unstable issue could be fixed in time, it's valuable. Do
you think so?

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