[Bug 85908] [BSW]igt/kms_render and pm_rpm cause *ERROR* pipe A underrun

[bugzilla-daemon at freedesktop.org]

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

--- Comment #5 from lu hua <huax.lu at intel.com> ---
kms_3d also has this error.
root at x-bsw01:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./kms_3d
IGT-Version: 1.9-geb799b2 (x86_64) (Linux:
3.18.0-rc7_drm-intel-next-queued_140fd3_20141226+ x86_64)
Testing:
    1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 0x20015 0x40 74250
(3D:SBSH)
    1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 0x20015 0x40 74176
(3D:SBSH)
    1920x1080i 50 1920 2448 2492 2640 1080 1084 1094 1125 0x20015 0x40 74250
(3D:SBSH)
    1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 0x1c005 0x40 74250
(3D:TB)
    1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 0x4005 0x40 74250
(3D:FP)
    1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 0x1c005 0x40 74176
(3D:TB)
    1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 0x4005 0x40 74176
(3D:FP)
    1280x720 60 1280 1336 1472 1664 720 721 724 746 0x1c006 0x0 74440 (3D:TB)
    1280x720 60 1280 1336 1472 1664 720 721 724 746 0x4006 0x0 74440 (3D:FP)
    1280x720 60 1280 1390 1430 1650 720 725 730 750 0x1c005 0x40 74250 (3D:TB)
    1280x720 60 1280 1390 1430 1650 720 725 730 750 0x4005 0x40 74250 (3D:FP)
    1280x720 60 1280 1390 1430 1650 720 725 730 750 0x1c005 0x40 74176 (3D:TB)
    1280x720 60 1280 1390 1430 1650 720 725 730 750 0x4005 0x40 74176 (3D:FP)
    1280x720 50 1280 1720 1760 1980 720 725 730 750 0x1c005 0x40 74250 (3D:TB)
    1280x720 50 1280 1720 1760 1980 720 725 730 750 0x4005 0x40 74250 (3D:FP)
root at x-bsw01:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r | egrep
"<[1-6]>" |grep drm
<3>[  441.702497] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
A FIFO underrun
<3>[  442.269490] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
pipe A underrun
<3>[  442.269671] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
A FIFO underrun
<3>[  442.861626] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
A FIFO underrun
<3>[  443.427750] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
A FIFO underrun
<3>[  444.070666] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
A FIFO underrun
<3>[  444.613791] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
A FIFO underrun
<3>[  445.223455] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
A FIFO underrun

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