[Bug 72773] New: [BDW]igt/kms_flip/rcs-wf_vblank-vs-dpms-interruptible causes <3>[ 30.381756] [drm:__gen6_gt_force_wake_mt_get] *ERROR* Timed out waiting for forcewake old ack to clear.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72773

          Priority: high
            Bug ID: 72773
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW]igt/kms_flip/rcs-wf_vblank-vs-dpms-interruptible
                    causes <3>[   30.381756]
                    [drm:__gen6_gt_force_wake_mt_get] *ERROR* Timed out
                    waiting for forcewake old ack to clear.
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 90854
  --> https://bugs.freedesktop.org/attachment.cgi?id=90854&action=edit
dmesg

System Environment:
--------------------------
Platform: BDW
kernel: (drm-intel-nightly)22dd82bce1840fe48d683a29cccc443281b10248

Bug detailed description:
-------------------------
Run ./kms_flip --run-subtest rcs-wf_vblank-vs-dpms-interruptible
 <3>[   30.381756] [drm:__gen6_gt_force_wake_mt_get] *ERROR* Timed out waiting
for forcewake old ack to clear. appears in dmesg.

Test on earlier commit, It also has this issue.

output:
IGT-Version: 1.5-g1653106 (x86_64) (Linux:
3.13.0-rc3_drm-intel-nightly_22dd82_20131216+ x86_64)
Using monotonic timestamps
Beginning rcs-wf_vblank-vs-dpms-interruptible on crtc 3, connector 10
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
Temporarily disabled
.
rcs-wf_vblank-vs-dpms-interruptible on crtc 3, connector 10: PASSED

Beginning rcs-wf_vblank-vs-dpms-interruptible on crtc 5, connector 10
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
Temporarily disabled
.
rcs-wf_vblank-vs-dpms-interruptible on crtc 5, connector 10: PASSED

Beginning rcs-wf_vblank-vs-dpms-interruptible on crtc 7, connector 10
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
Temporarily disabled
.
rcs-wf_vblank-vs-dpms-interruptible on crtc 7, connector 10: PASSED

Subtest rcs-wf_vblank-vs-dpms-interruptible: SUCCESS

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