[Bug 79050] [PNV/BDW Regression]igt/kms_flip some subcases fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79050

--- Comment #3 from Guo Jinxian <jinxianx.guo at intel.com> ---
The failure still able to reproduce on latest
-fixes(2a592bec50994597716c633191ed6bf7af14defc) on ILK while running tests
below:
igt/kms_flip/2x-dpms-vs-vblank-race
igt/kms_flip/2x-dpms-vs-vblank-race-interruptible
igt/kms_flip/2x-modeset-vs-vblank-race


[root at x-e6510 tests]# ./kms_flip --run-subtest
2x-dpms-vs-vblank-race-interruptible
IGT-Version: 1.7-gf473a55 (i686) (Linux:
3.17.0-rc2_drm-intel-fixes_2a592b_20140902+ i686)
Using monotonic timestamps
Beginning 2x-dpms-vs-vblank-race-interruptible on crtc 7:11, connector 16:13
  1366x768 60 1366 1398 1422 1426 768 771 775 806 0x9 0x48 69000
  1366x768 60 1366 1398 1422 1426 768 771 775 806 0x9 0x48 69000
Test assertion failure function run_test_step, file kms_flip.c:884:
Failed assertion: end - start > 1 * frame_time(o) / 2 && end - start < 3 *
frame_time(o) / 2
Last errno: 4, Interrupted system call
Subtest 2x-dpms-vs-vblank-race-interruptible: FAIL

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