[Bug 85218] New: [IVB/BDW Regression]igt/kms_flip some subcases fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85218

            Bug ID: 85218
           Summary: [IVB/BDW Regression]igt/kms_flip some subcases fail
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Keywords: bisect_pending
          Severity: normal
          Priority: high
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jinxianx.guo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108085
  --> https://bugs.freedesktop.org/attachment.cgi?id=108085&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes.
It's a igt regression bug 
Good commit: e11b7100c9c8d4e74a4d4439b1519ea50741fda5
Bud commit: bba1cd0091b3e8e987f15dac1f38d233b5b0ee78

Non-working platforms: IVB BDW

==kernel==
--------------------------
origin/drm-intel-nightly: 8d1dbeed28a28ecf964769bf089503f0c90ffdaa(fails)
    drm-intel-nightly: 2014y-10m-19d-14h-54m-38s UTC integration manifest
origin/drm-intel-next-queued: 6476486cb3570d3662e4a3870b884e75d35d1072(fails)
    drm/i915: Document that mmap forwarding is discouraged
origin/drm-intel-fixes: bfe01a5ba2490f299e1d2d5508cbbbadd897bbe9(fails)
    Linux 3.17

==Bug detailed description==
igt/kms_flip some subcases fail

Case list:
igt/kms_flip/blocking-wf_vblank
igt/kms_flip/flip-vs-absolute-wf_vblank
igt/kms_flip/flip-vs-absolute-wf_vblank-interruptible
igt/kms_flip/flip-vs-blocking-wf-vblank
igt/kms_flip/flip-vs-wf_vblank
igt/kms_flip/flip-vs-wf_vblank-interruptible
igt/kms_flip/plain-flip-fb-recreate
igt/kms_flip/plain-flip-fb-recreate-interruptible
igt/kms_flip/plain-flip-ts-check
igt/kms_flip/plain-flip-ts-check-interruptible
igt/kms_flip/wf_vblank-ts-check
igt/kms_flip/wf_vblank-ts-check-interruptible


Output:
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./kms_flip
--run-subtest blocking-wf_vblank
IGT-Version: 1.8-gbba1cd0 (x86_64) (Linux:
3.17.0_drm-intel-nightly_8d1dbe_20141020+ x86_64)
Using monotonic timestamps
Beginning blocking-wf_vblank on crtc 8, connector 19
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
..Test assertion failure function check_state, file kms_flip.c:585:
Failed assertion: fabs((((double) diff.tv_usec) - usec_interflip) /
usec_interflip) <= 0.005
inter-vblank ts jitter: 0s, 166664us
Subtest blocking-wf_vblank: FAIL (1.442s)


==Reproduce steps==
---------------------------- 
1. ./kms_flip --run-subtest blocking-wf_vblank

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