[Bug 79285] New: [IVB/BDW]igt/kms_flip subcases vblank-vs-hang and vblank-vs-hang-interruptible fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79285

          Priority: medium
            Bug ID: 79285
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB/BDW]igt/kms_flip subcases vblank-vs-hang and
                    vblank-vs-hang-interruptible fail
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 99909
  --> https://bugs.freedesktop.org/attachment.cgi?id=99909&action=edit
dmesg

==System Environment==
--------------------------
Regression: No. 
These cases always fail

Non-working platforms: IVB BDW

==kernel==
--------------------------
origin/drm-intel-nightly: c37f30ddc2921eccbf0be87c7742b56fbde53a81(fails)
    drm-intel-nightly: 2014y-05m-23d-13h-57m-55s integration manifest
origin/drm-intel-next-queued: f83d6518a13020e3cf7abbcc6b4e6d34459d9a9f(fails)
    ddrm/i915: Kill private_default_ctx off    
origin/drm-intel-fixes: c1240bd2842f6ec26d7dc1d9c845a197a41d33fe(skips)
    drm/i915: Prevent negative relocation deltas from wrapping

==Bug detailed description==
-----------------------------
igt/kms_flip subcases vblank-vs-hang and vblank-vs-hang-interruptible fail

Output:
./kms_flip --run-subtest vblank-vs-hang
IGT-Version: 1.6-gff3c122 (x86_64) (Linux:
3.15.0-rc3_drm-intel-next-queued_f83d65_20140526+ x86_64)
Using monotonic timestamps
Beginning vblank-vs-hang on crtc 5, connector 14
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
........................Test assertion failure function wait_for_events, file
kms_flip.c:1164:
Last errno: 0, Success
Failed assertion: ret > 0
select timed out or error (ret 0)
Subtest vblank-vs-hang: FAIL

==Reproduce steps==
---------------------------- 
1.  ./kms_flip --run-subtest vblank-vs-hang

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