[Bug 83471] [SNB Regression]igt/kms_flip some subcases fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83471

--- Comment #1 from Guo Jinxian <jinxianx.guo at intel.com> ---
This failure is able to reproduce on IVB

[root at x-ivb6 tests]# ./kms_flip --run-subtest vblank-vs-suspend
IGT-Version: 1.8-g4b81e9c (x86_64) (Linux:
3.17.0-rc6_drm-intel-fixes_0f33be_20140923_debug+ x86_64)
Using monotonic timestamps
Beginning vblank-vs-suspend on crtc 7, connector 17
  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
.rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Sep 24 14:35:27 2014
.rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Sep 24 14:35:59 2014
Test assertion failure function check_state, file kms_flip.c:555:
Failed assertion: timercmp(&es->last_received_ts, &es->current_ts, <)
vblank ts before the vblank was issued!
timerdiff -1235s, 711943us
Subtest vblank-vs-suspend: FAIL (2.557s)

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