[Bug 85784] New: [BYT]igt/kms_mmio_vs_cs_flip/setcrtc_vs_cs_flip sporadically fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85784

            Bug ID: 85784
           Summary: [BYT]igt/kms_mmio_vs_cs_flip/setcrtc_vs_cs_flip
                    sporadically fail
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108822
  --> https://bugs.freedesktop.org/attachment.cgi?id=108822&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure
Non-working platforms: BYT

==kernel==
--------------------------
drm-intel-nightly/bd299eab17bc3372e73094ad6d5d9db959c7beef

==Bug detailed description==
It fails 1 in 5 runs.

output:
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc2_drm-intel-nightly_bd299e_20141102+ x86_64)
Test assertion failure function test_crtc, file kms_mmio_vs_cs_flip.c:500:
Failed assertion: igt_crc_equal(&ref_crc, &crc)
Subtest setcrtc_vs_cs_flip: FAIL (16.939s)

==Reproduce steps==
---------------------------- 
1. ./kms_mmio_vs_cs_flip --run-subtest setcrtc_vs_cs_flip

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