[Bug 66482] New: igt/kms_flip/absolute-wf_vblank randomly causes <3>[ 1.211971] [drm:intel_pipe_config_compare] *ERROR* mismatch in adjusted_mode.flags (expected 0, found 1)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66482

          Priority: medium
            Bug ID: 66482
                CC: xunx.fang at intel.com, yangweix.shui at intel.com
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: igt/kms_flip/absolute-wf_vblank randomly causes <3>[
                     1.211971] [drm:intel_pipe_config_compare] *ERROR*
                    mismatch in adjusted_mode.flags (expected 0, found 1)
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 81843
  --> https://bugs.freedesktop.org/attachment.cgi?id=81843&action=edit
dmesg

System Environment:
--------------------------
Arch:           x86_64
Platform:       GM45/ILK/SNB/IVB/HSW
Kernel: (drm-intel-next-queued)e84d8bb431a656c0c94ecfe67a3c64f4f27e48b7

Bug detailed description:
-----------------------------
It randomly happens on GM45 ironlake sandybridge ivybridge and haswell with
drm-intel-next-queued and drm-intel-fixes kernel.
It happens 1 in 10 runs.
Following cases also randomly causes <3>[    1.211971]
[drm:intel_pipe_config_compare] *ERROR* mismatch in adjusted_mode.flags
(expected 0, found 1):

igt/gem_flink/bad-flink
igt/kms_flip/blocking-absolute-wf_vblank
igt/kms_flip/blocking-wf_vblank
igt/kms_flip/delayed-flip-vs-dpms
igt/kms_flip/delayed-flip-vs-modeset
igt/kms_flip/delayed-flip-vs-panning
igt/kms_flip/delayed-wf_vblank-vs-dpms
igt/kms_flip/delayed-wf_vblank-vs-modeset
igt/kms_flip/flip-vs-absolute-wf_vblank
igt/kms_flip/flip-vs-bad-tiling
igt/kms_flip/flip-vs-blocking-wf-vblank
igt/kms_flip/flip-vs-dpms
igt/kms_flip/flip-vs-dpms-off-vs-modeset
igt/kms_flip/flip-vs-expired-vblank
igt/kms_flip/flip-vs-modeset
igt/kms_flip/flip-vs-panning
igt/kms_flip/flip-vs-rmfb
igt/kms_flip/flip-vs-wf_vblank
igt/kms_flip/plain-flip
igt/kms_flip/plain-flip-fb-recreate
igt/kms_flip/plain-flip-ts-check
igt/kms_flip/single-buffer-flip-vs-dpms-off-vs-modeset
igt/kms_flip/wf_vblank
igt/kms_flip/wf_vblank-ts-check
igt/kms_flip/wf_vblank-vs-dpms
igt/kms_flip/wf_vblank-vs-modeset
igt/kms_render/direct-render
igt/kms_render/gpu-blit
igt/testdisplay

output:
Using monotonic timestamps
running testcase: flip-vs-absolute-wf_vblank
Beginning flip-vs-absolute-wf_vblank on crtc 3, connector 18
  1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 0x5 0x48 148500
.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
flip-vs-absolute-wf_vblank on crtc 3, connector 18: PASSED

Beginning flip-vs-absolute-wf_vblank on crtc 5, connector 18
  1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 0x5 0x48 148500
.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
flip-vs-absolute-wf_vblank on crtc 5, connector 18: PASSED

Beginning flip-vs-absolute-wf_vblank on crtc 7, connector 18
  1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 0x5 0x48 148500
.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
flip-vs-absolute-wf_vblank on crtc 7, connector 18: PASSED

dmesg -r | egrep "<[1-3]>" |grep drm
<3>[    1.211971] [drm:intel_pipe_config_compare] *ERROR* mismatch in
adjusted_mode.flags (expected 0, found 1)

Reproduce steps:
----------------------------
1. ./kms_flip --run-subtest flip-vs-absolute-wf_vblank

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