[Bug 89052] New: [SKL]=?UTF-8?Q?=20=E2=80=9Ctestdisplay=20=E2=80=93d=2032=E2=80=9D=20lead=20kernel=20BUG=20at=20drivers?=/gpu/drm/i915/intel_display.c:2766!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89052

            Bug ID: 89052
           Summary: [SKL] “testdisplay –d 32” lead kernel BUG at
                    drivers/gpu/drm/i915/intel_display.c:2766!
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jeff.zheng at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 113294
  --> https://bugs.freedesktop.org/attachment.cgi?id=113294&action=edit
dmesg log runnig testdisplay -d 32

==System Environment==
--------------------------
BIOS: V68

Regression: No. First test on this platform

Non-working platforms: SKL

==kernel==
--------------------------
-nightly: 2015_02_09 commit /b4442ee4e150506cebeee72249efc566c5f14bbe(fails)

==Bug detailed description==
-----------------------------
Running “testdisplay –d 32” lead kernel BUG at
drivers/gpu/drm/i915/intel_display.c:2766!

testdisplay process is unable to be killed after that.


==Reproduce steps==
---------------------------- 
1. Run "testdisplay -d 32"
2. Check dmesg

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