[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

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

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

--- Comment #12 from lu hua <huax.lu at intel.com> ---
Test on IVB with the latest drm-intel-nightly kernel. It still exists.
[root at x-ivb9 tests]# ./testdisplay
CRTC(20):[0]  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x48 65000
CRTC(20):[1]  1024x768 75 1024 1040 1136 1312 768 769 772 800 0x5 0x40 78800
CRTC(20):[2]  800x600 75 800 816 896 1056 600 601 604 625 0x5 0x40 49500
CRTC(20):[3]  800x600 60 800 840 968 1056 600 601 605 628 0x5 0x40 40000
CRTC(20):[4]  640x480 75 640 656 720 840 480 481 484 500 0xa 0x40 31500
CRTC(20):[5]  640x480 60 640 656 752 800 480 490 492 525 0xa 0x40 25200
CRTC(20):[6]  720x400 70 720 738 846 900 400 412 414 449 0x6 0x40 28320
SUCCESS (297.282s)
[root at x-ivb9 tests]# dmesg -r|egrep "<[1-4]>"|grep drm
<3>[  292.244378] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
uncleared fifo underrun on pipe A
<3>[  292.244406] [drm:ironlake_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun

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