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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #8 from lu hua <huax.lu at intel.com> ---
Detail info:
Test on IVB with drm-intel-nightly kernel.
1. clean boot system with VGA: 
   system report this error, run dmesg -c then run some cases, this error
doesn't appear.

2. clean boot system with headless:
  system doesn't have this error,  run dmesg -c then run some cases, this error
appears.

Run following cases have this issue:
igt/kms_flip/flip-vs-modeset-vs-hang-interruptible
igt/kms_flip/flip-vs-panning
igt/kms_flip/flip-vs-panning-vs-hang-interruptible
igt/kms_flip/flip-vs-rmfb
igt/kms_flip/vblank-vs-hang-interruptible
igt/kms_flip/vblank-vs-modeset-suspend
igt/kms_pipe_crc_basic/read-crc-pipe-A
igt/kms_setmode/clone-single-crtc

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