[Bug 81083] New: [SNB/IVB/HSW/BYT Regression]igt/kms_plane some subcases timeout

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81083

          Priority: high
            Bug ID: 81083
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB/IVB/HSW/BYT Regression]igt/kms_plane some
                    subcases timeout
        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 102464
  --> https://bugs.freedesktop.org/attachment.cgi?id=102464&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 
It's a igt regression bug.
Good commit on igt: 67e29a30d5da57fb6764a23ba9f6aa31ea2c15a8
bad commit on igt: 8d60b8267e97f9b04e42912262c170c473d4f061

Non-working platforms: SNB IVB HSW BYT

==kernel==
--------------------------
origin/drm-intel-nightly: ed4d04defe2c6962efe8f4ba3587a8e69e06d2dd(fails)
    drm-intel-nightly: 2014y-07m-08d-21h-05m-49s integration manifest
origin/drm-intel-next-queued: 31685c258e0b0ad6aa486c5ec001382cf8a64212(fails)
    drm/i915/vlv: WA for Turbo and RC6 to work together.
origin/drm-intel-fixes: 72f5fd2a9815b49d0e6df063025aa55e9bc2435d(fails)
    drm/i915/vlv: T12 eDP panel timing enforcement during reboot

==Bug detailed description==
-----------------------------
igt/kms_plane some subcases timeout

Case list:
igt/kms_plane/plane-position-covered-pipe-B-plane-1
igt/kms_plane/plane-position-covered-pipe-B-plane-2
igt/kms_plane/plane-position-covered-pipe-C-plane-1
igt/kms_plane/plane-position-covered-pipe-C-plane-2
igt/kms_plane/plane-position-hole-pipe-B-plane-1
igt/kms_plane/plane-position-hole-pipe-B-plane-2
igt/kms_plane/plane-position-hole-pipe-C-plane-1
igt/kms_plane/plane-position-hole-pipe-C-plane-2

Output:
[root at x-ivb9 tests]# ./kms_plane --run-subtest
plane-position-covered-pipe-C-plane-1
IGT-Version: 1.7-g8d60b82 (x86_64) (Linux:
3.15.0-rc8_drm-intel-next-queued_1267a2_20140703+ x86_64)
Testing connector VGA-1 using pipe C plane 1
Subtest plane-position-covered-pipe-C-plane-1: TIMEOUT

==Reproduce steps==
---------------------------- 
1. ./kms_plane --run-subtest plane-position-covered-pipe-C-plane-1

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