[Bug 76823] New: [IVB]Calltrace after running drv_suspend/forcewake:WARNING: CPU: 1 PID: 4409 at drivers/gpu/drm/i915/intel_uncore.c:460 gen6_gt_force_wake_put+0xed/0x13c [i915]()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76823

          Priority: medium
            Bug ID: 76823
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB]Calltrace after running
                    drv_suspend/forcewake:WARNING: CPU: 1 PID: 4409 at
                    drivers/gpu/drm/i915/intel_uncore.c:460
                    gen6_gt_force_wake_put+0xed/0x13c [i915]()
        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 96643
  --> https://bugs.freedesktop.org/attachment.cgi?id=96643&action=edit
dmesg about drv_suspend/forcewake

System Environment:
--------------------------
Platform: IVB
kernel:   (drm-intel-nightly)19f629e96704b796efdad3cf13b1e8fb387d8ca7

Bug detailed description:
---------------------------
After running drv_suspend/forcewake, Calltrace WARNING: CPU: 1 PID: 4409 at
drivers/gpu/drm/i915/intel_uncore.c:460 gen6_gt_force_wake_put+0xed/0x13c
[i915]() occurs.

This bug occurs on -nightly and -next-queued branch, bug passed on -fixes
branch.

Test was blocked by bug 76580 before.

output on -nightly kernel:
./drv_suspend --run-subtest forcewake
IGT-Version: 1.6-g4fdca96 (x86_64) (Linux:
3.14.0-rc8_drm-intel-nightly_19f629_20140331_debug+ x86_64)
rtcwake: wakeup from "mem" using /dev/rtc0 at Mon Mar 31 21:34:30 2014
Subtest forcewake: SUCCESS


Reproduce steps:
---------------------------- 
1. ./drv_suspend --run-subtest forcewake

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