[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 #5 from Guo Jinxian <jinxianx.guo at intel.com> ---
This bug still able to reproduce on latest
-fixes(f4be89cecea437aaddd7700d05c6bdb5678041f7) while running subcases of
igt/kms_cursor_crc

[root at x-pk1 tests]# ./kms_cursor_crc --run-subtest cursor-256-random
IGT-Version: 1.7-ge48c495 (x86_64) (Linux:
3.16.0-rc6_drm-intel-fixes_f4be89_20140729+ x86_64)
Beginning cursor-256-random on pipe A, connector VGA-1
..................................................
cursor-256-random on pipe A, connector VGA-1: PASSED

Beginning cursor-256-random on pipe B, connector VGA-1
..................................................
cursor-256-random on pipe B, connector VGA-1: PASSED

Subtest cursor-256-random: SUCCESS
[root at x-pk1 tests]# dmesg -r|egrep "<[1-4]>"|grep drm
<3>[ 5012.852373] [drm:ilk_display_irq_handler] *ERROR* Pipe B FIFO underrun
<3>[ 5012.852423] [drm:ibx_irq_handler] *ERROR* PCH transcoder B FIFO underrun


[root at x-pk1 tests]# ./kms_cursor_crc --run-subtest cursor-256-sliding
IGT-Version: 1.7-ge48c495 (x86_64) (Linux:
3.16.0-rc6_drm-intel-fixes_f4be89_20140729+ x86_64)
Beginning cursor-256-sliding on pipe A, connector VGA-1
................................................
cursor-256-sliding on pipe A, connector VGA-1: PASSED

Beginning cursor-256-sliding on pipe B, connector VGA-1
................................................
cursor-256-sliding on pipe B, connector VGA-1: PASSED

Subtest cursor-256-sliding: SUCCESS
[root at x-pk1 tests]# dmesg -r|egrep "<[1-4]>"|grep drm
<3>[ 5188.467366] [drm:ilk_display_irq_handler] *ERROR* Pipe A FIFO underrun
<3>[ 5188.467421] [drm:ibx_irq_handler] *ERROR* PCH transcoder A FIFO underrun
<3>[ 5198.614339] [drm:ilk_display_irq_handler] *ERROR* Pipe B FIFO underrun
<3>[ 5198.614396] [drm:ibx_irq_handler] *ERROR* PCH transcoder B FIFO underrun

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