[Bug 85906] [BSW]igt/kms_setmode sporadically causes *ERROR* CPU pipe C FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85906

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #2 from lu hua <huax.lu at intel.com> ---
root at x-bsw08:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./kms_setmode
--run-subtest clone-exclusive-crtc
IGT-Version: 1.9-g9846e7f (x86_64) (Linux:
3.19.0_drm-intel-nightly_dbd79c_20150213+ x86_64)
Testing: clone-exclusive-crtc 2 connector combinations
  Test id#1 CRTC count 2
    CRTC[20] [Pipe A] Mode: 1920x1080 at 60Hz Connectors: eDP-1[41]
    CRTC[25] [Pipe B] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[34] (NC)
  Test id#2 CRTC count 2
    CRTC[25] [Pipe B] Mode: 1920x1080 at 60Hz Connectors: eDP-1[41]
    CRTC[20] [Pipe A] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[34] (NC)
  Test id#3 CRTC count 2
    CRTC[20] [Pipe A] Mode: 1920x1080 at 60Hz Connectors: eDP-1[41]
    CRTC[30] [Pipe C] Mode: 640x480 at 60Hz Connectors: HDMI-A-2[47] (NC)
  Test id#4 CRTC count 2
    CRTC[25] [Pipe B] Mode: 1920x1080 at 60Hz Connectors: eDP-1[41]
    CRTC[30] [Pipe C] Mode: 640x480 at 60Hz Connectors: HDMI-A-2[47] (NC)
  Test id#5 CRTC count 2
    CRTC[20] [Pipe A] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[34] (NC)
    CRTC[30] [Pipe C] Mode: 640x480 at 60Hz Connectors: HDMI-A-2[47] (NC)
  Test id#6 CRTC count 2
    CRTC[25] [Pipe B] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[34] (NC)
    CRTC[30] [Pipe C] Mode: 640x480 at 60Hz Connectors: HDMI-A-2[47] (NC)
Testing: clone-exclusive-crtc 3 connector combinations
  Test id#7 CRTC count 3
    CRTC[20] [Pipe A] Mode: 1920x1080 at 60Hz Connectors: eDP-1[41]
    CRTC[25] [Pipe B] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[34] (NC)
    CRTC[30] [Pipe C] Mode: 640x480 at 60Hz Connectors: HDMI-A-2[47] (NC)
  Test id#8 CRTC count 3
    CRTC[25] [Pipe B] Mode: 1920x1080 at 60Hz Connectors: eDP-1[41]
    CRTC[20] [Pipe A] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[34] (NC)
    CRTC[30] [Pipe C] Mode: 640x480 at 60Hz Connectors: HDMI-A-2[47] (NC)
Subtest clone-exclusive-crtc: SUCCESS (43.524s)
root at x-bsw08:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r|egrep
"<[1-4]>"|grep drm
<3>[  341.728152] [drm:i9xx_check_fifo_underruns [i915]] *ERROR* pipe B
underrun
<3>[  341.744854] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
B FIFO underrun
<3>[  342.214618] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
A FIFO underrun
<3>[  342.214653] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
C FIFO underrun

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