[Bug 85898] [IVB]igt/kms_flip/wf_vblank-interruptible sporadically causes *ERROR* uncleared pch fifo underrun on pch transcoder A

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85898

--- Comment #1 from lu hua <huax.lu at intel.com> ---
subcase rcs-wf_vblank-vs-modeset also has this issue.
[root at x-ivb9 tests]# ./kms_flip --run-subtest rcs-wf_vblank-vs-modeset
IGT-Version: 1.8-ge34240d (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_e6b3eb_20141107_debug+ x86_64)
Using monotonic timestamps
Beginning rcs-wf_vblank-vs-modeset on crtc 8, connector 18
  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
.......
rcs-wf_vblank-vs-modeset on crtc 8, connector 18: PASSED

Beginning rcs-wf_vblank-vs-modeset on crtc 12, connector 18
  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
......
rcs-wf_vblank-vs-modeset on crtc 12, connector 18: PASSED

Beginning rcs-wf_vblank-vs-modeset on crtc 16, connector 18
  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
......
rcs-wf_vblank-vs-modeset on crtc 16, connector 18: PASSED

Subtest rcs-wf_vblank-vs-modeset: SUCCESS (65.045s)
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[root at x-ivb9 tests]# dmesg -r|egrep "<[1-4]>"|grep drm
<3>[ 7658.287754] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
<3>[ 7658.287769] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH
transcoder A FIFO underrun

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