[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 #7 from Guo Jinxian <jinxianx.guo at intel.com> ---
Failure still able to reproduce on latest
-fixes(2a592bec50994597716c633191ed6bf7af14defc) while running test below:
igt/kms_flip/2x-dpms-vs-vblank-race
igt/kms_flip/2x-dpms-vs-vblank-race-interruptible


[root at x-e6510 tests]# ./kms_flip --run-subtest
2x-dpms-vs-vblank-race-interruptible
IGT-Version: 1.7-gf473a55 (i686) (Linux:
3.17.0-rc2_drm-intel-fixes_2a592b_20140902+ i686)
Using monotonic timestamps
Beginning 2x-dpms-vs-vblank-race-interruptible on crtc 7:11, connector 16:13
  1366x768 60 1366 1398 1422 1426 768 771 775 806 0x9 0x48 69000
  1366x768 60 1366 1398 1422 1426 768 771 775 806 0x9 0x48 69000
Test assertion failure function run_test_step, file kms_flip.c:884:
Failed assertion: end - start > 1 * frame_time(o) / 2 && end - start < 3 *
frame_time(o) / 2
Last errno: 4, Interrupted system call
Subtest 2x-dpms-vs-vblank-race-interruptible: FAIL
[root at x-e6510 tests]# dmesg -r|egrep "<[1-4]>"|grep drm
<3>[ 2729.498848] [drm:ilk_display_irq_handler] *ERROR* Pipe A FIFO underrun

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