[Bug 82232] New: [SNB Regression]igt/kms_flip/vblank-vs-modeset-suspend-interruptible fails sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82232

          Priority: high
            Bug ID: 82232
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB
                    Regression]igt/kms_flip/vblank-vs-modeset-suspend-inte
                    rruptible fails sporadically
        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 104138
  --> https://bugs.freedesktop.org/attachment.cgi?id=104138&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 
Good commit on -next-queued：34548e510657af829032f23128c0c01ebe48ef21(I tired 5
times and didn't reproduce this issue)
The fail rate about 1 out of 3

Non-working platforms: SNB

==kernel==
--------------------------
origin/drm-intel-nightly: 79e44bfa10063ee529140e88fdc401c4ce07d644(fails)
    drm-intel-nightly: 2014y-08m-06d-00h-42m-38s integration manifest
origin/drm-intel-next-queued: 414863f8733f79e7e25283499fdede1ca987f216(fails)
    drm/i915: Don't accumulate hangcheck score on forward progress
origin/drm-intel-fixes: 96d56d71a3bcd0a0015034a8f3decc46cb9ec855(fails)
    drm/i915: Fix crash when failing to parse MIPI VBT

==Bug detailed description==
igt/kms_flip/vblank-vs-modeset-suspend-interruptible fails sporadically

Output:
[root at x-sgb4 tests]# ./kms_flip --run-subtest
vblank-vs-modeset-suspend-interruptible
IGT-Version: 1.7-gac31f19 (i686) (Linux:
3.16.0_drm-intel-next-queued_414863_20140806+ i686)
Using monotonic timestamps
Beginning vblank-vs-modeset-suspend-interruptible on crtc 8, connector 14
  1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 0x5 0x48 148500
.rtcwake: wakeup from ""mem"" using /dev/rtc0 at Wed Aug  6 14:47:38 2014
Test assertion failure function igt_system_suspend_autoresume, file
igt_aux.c:325:
Failed assertion: ret == 0
Last errno: 4, Interrupted system call
Subtest vblank-vs-modeset-suspend-interruptible: FAIL

==Reproduce steps==
---------------------------- 
1. ./kms_flip --run-subtest vblank-vs-modeset-suspend-interruptible

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