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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [IVB/BDW Regression]igt/kms_flip some subcases fail"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=85218">85218</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[IVB/BDW Regression]igt/kms_flip some subcases fail
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Keywords</th>
          <td>bisect_pending
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>high
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DRM/Intel
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>jinxianx.guo@intel.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr></table>
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        <pre>Created <span class=""><a href="attachment.cgi?id=108085" name="attach_108085" title="dmesg">attachment 108085</a> <a href="attachment.cgi?id=108085&action=edit" title="dmesg">[details]</a></span>
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@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</pre>
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