[Bug 83180] New: [HSW Regression]igt/kms_plane some subcases cause "[drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared fifo underrun on pipe A"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83180

          Priority: high
            Bug ID: 83180
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW Regression]igt/kms_plane some subcases cause
                    "[drm:ivybridge_set_fifo_underrun_reporting] *ERROR*
                    uncleared fifo underrun on pipe A"
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 105373
  --> https://bugs.freedesktop.org/attachment.cgi?id=105373&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 
Good commit on -next-queued: 3a5f87c286515c54ff5c52c3e64d0c522b7570c0

Non-working platforms: HSW

==kernel==
--------------------------
origin/drm-intel-nightly: e91331cf71c509af3dfae75cd9bca3db13d7da95(fails)
    drm-intel-nightly: 2014y-08m-27d-21h-32m-10s integration manifest
origin/drm-intel-next-queued: 661ccef518a23dd6b3aff11ca6eee9c71568f37a(works)
    drm/i915/bdw: BDW Software Turbo
origin/drm-intel-fixes: 813008cd3e93ea8a571b2b7d5b9360a3105b50f7(fails)
    drm/i915: don't warn if backlight unexpectedly enabled

==Bug detailed description==
igt/kms_plane some subcases cause "[drm:ivybridge_set_fifo_underrun_reporting]
*ERROR* uncleared fifo underrun on pipe A"

Case list:
igt/kms_plane/plane-position-covered-pipe-A-plane-1
igt/kms_plane/plane-position-covered-pipe-C-plane-1

Output:
[root at x-hsw24 tests]# ./kms_plane --run-subtest
plane-position-covered-pipe-A-plane-1
IGT-Version: 1.7-g50166d2 (x86_64) (Linux:
3.16.0_drm-intel-next-queued_661cce_20140828+ x86_64)
Testing connector VGA-1 using pipe A plane 1
Subtest plane-position-covered-pipe-A-plane-1: SUCCESS
[root at x-hsw24 tests]# dmesg -r|egrep ""<[1-4]>""|grep drm
<3>[  114.145642] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe A
<3>[  114.145643] [drm:ivb_err_int_handler] *ERROR* Pipe A FIFO underrun
<3>[  114.145650] [drm:cpt_set_fifo_underrun_reporting] *ERROR* uncleared pch
fifo underrun on pch transcoder A
<3>[  114.145650] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO
underrun


==Reproduce steps==
---------------------------- 
1. ./kms_plane --run-subtest plane-position-covered-pipe-A-plane-1

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