[Bug 85908] [BSW]igt/kms_render causes *ERROR* pipe A underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85908

--- Comment #1 from lu hua <huax.lu at intel.com> ---
kms_fence_pin_leak also has this error on BSW.
[root at x-bsw01 tests]# ./kms_fence_pin_leak
IGT-Version: 1.8-gc049c39 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_9a7620_20141112+ x86_64)
................................................................
[root at x-bsw01 tests]# dmesg -r|egrep "<[1-4]>"|grep drm
<3>[  108.274532] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
pipe A underrun
<3>[  109.771823] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
pipe B underrun
<3>[  109.771999] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
B FIFO underrun

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