[Bug 89033] [SNB/IVB/BYT-M/HSW]igt/kms_flip some some cases hang and cause system unable to reboot.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89033

--- Comment #3 from Ding Heng <hengx.ding at intel.com> ---
Add HSW in this bug. After running several sub cases in kms_flip, every
kms_flip subcase will cause such dmesg output even it run well before:

dmesg -r |grep '<[1-4]>'|grep drm
<3>[10539.077274] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder A
<3>[10539.077283] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
<3>[10539.078778] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
uncleared fifo underrun on pipe A
<3>[10539.078788] [drm:ironlake_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun

And keep on running kms_flip subcases, you may see the case hang and not able
to be stopped and system could not reboot either.

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