[Bug 74102] [ILK/SNB/IVB/HSW/BDW]igt/testdisplay causes *ERROR* Pipe A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74102

--- Comment #14 from ye.tian <yex.tian at intel.com> ---
Tested on BDW with drm-intel-testing-2015-03-13 kernel.
show the error info: 
[drm:gen8_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

Reproduce steps:
----------------------
1,Connected the DP monitor
2,Do S3, echo m3m > /sys/power/state
3,Let the system resume
4,unplug and plug the DP
5, re-do step 2,3

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