[Bug 74102] New: [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

          Priority: high
            Bug ID: 74102
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [ILK/SNB/IVB/HSW Regression]igt/testdisplay causes
                    *ERROR* Pipe A FIFO underrun
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 92830
  --> https://bugs.freedesktop.org/attachment.cgi?id=92830&action=edit
dmesg

System Environment:
--------------------------
Platform: Ironlake
Kernel(drm-intel-nightly)f27f16540be56813df2ebb8e1106dd5c258f07c3

Bug detailed description:
-------------------------
igt/testdisplay causes <3>[  152.786238] [drm:ilk_display_irq_handler] *ERROR*
Pipe A FIFO underrun.
It happens on Ironlake, Sandybridge,Ivybridge, and Haswell with -queued and
-nightly kernel. It doesn't happen on -fixes kernel.

The latest known good commit: 74655033599ea5757a5305abf2577eea586cd295
The latest known bad commit: fc2c807b7a2b2ca8dbe2aed2f5ae730c19beeda5

output:
CRTC(3):[0]  1280x1024 60 1280 1328 1440 1688 1024 1025 1028 1066 0x5 0x48
108000
CRTC(3):[1]  1280x1024 75 1280 1296 1440 1688 1024 1025 1028 1066 0x5 0x40
135000
CRTC(3):[2]  1152x864 75 1152 1216 1344 1600 864 865 868 900 0x5 0x40 108000
CRTC(3):[3]  1024x768 75 1024 1040 1136 1312 768 769 772 800 0x5 0x40 78800
CRTC(3):[4]  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
CRTC(3):[5]  800x600 75 800 816 896 1056 600 601 604 625 0x5 0x40 49500
CRTC(3):[6]  800x600 60 800 840 968 1056 600 601 605 628 0x5 0x40 40000
CRTC(3):[7]  640x480 75 640 656 720 840 480 481 484 500 0xa 0x40 31500
CRTC(3):[8]  640x480 60 640 656 752 800 480 490 492 525 0xa 0x40 25200
CRTC(3):[9]  720x400 70 720 738 846 900 400 412 414 449 0x6 0x40 28320

Reproduce steps:
-------------------------
1. ./testdisplay

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