*** Bug 102706 has been marked as a duplicate of this bug. ***

This has now be caught on 4 tests:
igt@kms_flip@basic-flip-vs-dpms
igt@kms_flip@dpms-off-confusion
igt@kms_flip@wf_vblank-vs-dpms
igt@kms_flip@wf_vblank-vs-modeset

more data:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3101/shard-hsw5/igt@kms_flip@dpms-off-confusion.html

Now also on the subtest:
igt@kms_flip@wf_vblank-vs-dpms-interruptible

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3163/shard-hsw5/igt@kms_flip@wf_vblank-vs-dpms-interruptible.html

Also, on subtest:
rcs-wf_vblank-vs-modeset-interruptible
see:
https://patchwork.freedesktop.org/series/31305/

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3352/shard-hsw5/igt@kms_flip@rcs-wf_vblank-vs-dpms-interruptible.html


[  511.608785] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[  511.608813] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3358/shard-hsw5/igt@kms_plane@plane-panning-top-left-pipe-c-planes.html

(kms_plane:4191) igt-debugfs-CRITICAL: Test assertion failure function igt_assert_crc_equal, file igt_debugfs.c:353:
(kms_plane:4191) igt-debugfs-CRITICAL: Failed assertion: !mismatch
Subtest plane-panning-top-left-pipe-C-planes failed.

[  315.397653] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[  315.397705] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3359/shard-hsw5/igt@kms_flip@flip-vs-modeset-interruptible.html


[  244.342563] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[  244.342651] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3377/shard-hsw5/igt@kms_flip@blt-flip-vs-panning-interruptible.html

[  208.888963] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[  208.889016] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
[  211.081133] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe B
[  211.081186] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4068/shard-hsw5/igt@kms_flip@rcs-wf_vblank-vs-modeset.html

[  245.854988] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[  245.855100] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4069/shard-hsw5/igt@kms_rotation_crc@cursor-rotation-180.html

[  257.604823] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[  257.604933] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3628/shard-hsw5/igt@kms_flip@flip-vs-dpms-off-vs-modeset.html

[   13.083870] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[   13.083937] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3636/shard-hsw5/igt@kms_flip@flip-vs-fences-interruptible.html

[   46.259782] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[   46.259808] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3645/shard-hsw5/igt@kms_flip@2x-blt-wf_vblank-vs-dpms.html

[  383.119763] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[  383.119827] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3683/shard-hsw5/igt@kms_flip@2x-flip-vs-modeset-interruptible.html

[  598.216299] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[  598.216326] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3813/shard-hsw5/igt@kms_vblank@pipe-c-wait-idle.html


[ 1314.660451] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[ 1314.660472] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3835/shard-hsw5/igt@kms_vblank@pipe-a-query-forked-busy-hang.html

from dmesg:
<7>[  829.768537] missed_breadcrumb *
<7>[  829.768549] missed_breadcrumb Idle? no
<7>[  841.736597] [drm:i915_reset_device [i915]] resetting chip
<5>[  841.736895] i915 0000:00:02.0: Resetting chip after gpu hang
<7>[  841.737399] [drm:i915_gem_reset_engine [i915]] resetting rcs0 to restart from tail of request 0x3
<7>[  841.737992] [drm:sandybridge_pcode_read [i915]] warning: pcode (read from mbox 5) mailbox access failed for intel_enable_gt_powersave [i915]: -6
<7>[  841.738243] [drm:init_workarounds_ring [i915]] rcs0: Number of context specific w/a: 0
...
<3>[  841.840039] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
<3>[  841.840280] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3883/shard-hsw5/igt@kms_busy@extended-modeset-hang-newfb-render-b.html

[  607.100851] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[  607.100904] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3887/shard-hsw5/igt@kms_vblank@pipe-b-wait-idle.html

[ 1110.735788] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[ 1110.735836] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3887/shard-hsw5/igt@kms_cursor_legacy@cursorb-vs-flipa-varying-size.html

[ 1116.078311] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A
[ 1116.078706] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4360/shard-hsw5/igt@kms_atomic_transition@1x-modeset-transitions-nonblocking.html

[ 1184.609072] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[ 1184.609089] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3939/shard-hsw5/igt@kms_busy@basic-modeset-a.html

[  192.692144] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[  192.692223] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3939/shard-hsw5/igt@gem_fenced_exec_thrash@2-spare-fences.html

[  195.401720] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A
[  195.402234] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

I have cleaned up the impact of this bug a bit in cibuglog since the old links are dead.

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3990/shard-hsw5/igt@kms_frontbuffer_tracking@fbc-1p-primscrn-spr-indfb-draw-render.html

<7>[  814.602967] [drm:intel_enable_pipe [i915]] enabling pipe A
<7>[  814.603086] [drm:haswell_crtc_enable [i915]] iCLKIP clock: found settings for 65000KHz refresh rate: auxdiv=0, divsel=27, phasedir=0, phaseinc=22
<3>[  814.670444] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
<3>[  814.670742] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4016/shard-hsw5/igt@kms_flip@flip-vs-modeset-vs-hang.html

[  171.746919] i915 0000:00:02.0: Resetting chip for no progress on rcs0
[  171.791561] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[  171.791623] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4018/shard-hsw3/igt@kms_vblank@pipe-c-query-forked-busy.html

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4407/shard-hsw5/igt@kms_properties@crtc-properties-atomic.html

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4031/shard-hsw5/igt@kms_frontbuffer_tracking@fbc-2p-pri-indfb-multidraw.html
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4029/shard-hsw5/igt@kms_chv_cursor_fail@pipe-c-128x128-right-edge.html
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4031/shard-hsw5/igt@gem_mmap_gtt@forked-medium-copy-odd.html

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4038/shard-hsw5/igt@kms_plane@pixel-format-pipe-b-planes.html
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4038/shard-hsw5/igt@kms_cursor_legacy@pipe-c-torture-move.html

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4043/shard-hsw5/igt@kms_atomic_transition@plane-all-modeset-transition.html

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_27/fi-hsw-4200u/igt@kms_plane_lowres@pipe-c-tiling-none.html

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_28/fi-hsw-4200u/igt@kms_panel_fitting@atomic-fastset.html

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_29/fi-hsw-4200u/igt@kms_panel_fitting@atomic-fastset.html

[  168.296571] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A
[  168.296682] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[  169.796559] [drm:intel_check_cpu_fifo_underruns [i915]] *ERROR* fifo underrun on pipe B
[  170.931908] [drm:intel_check_cpu_fifo_underruns [i915]] *ERROR* fifo underrun on pipe C

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_28/fi-hsw-4200u/igt@kms_plane_lowres@pipe-c-tiling-x.html

[  239.614337] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe C
[  239.614715] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe C FIFO underrun

Also seen on the HSW chromebook:

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_30/fi-hsw-peppy/igt@kms_atomic_transition@plane-all-transition-nonblocking.html

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_30/fi-hsw-peppy/igt@kms_atomic_transition@plane-all-transition-fencing.html

This issue occurs in every round of drmtip and CI DRM execution.

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_5205/shard-hsw5/igt@kms_flip@2x-flip-vs-dpms-interruptible.html

<3> [293.475835] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A

The CI Bug Log issue associated to this bug has been updated.

### New filters associated

* HSW: igt@i915_suspend@sysfs-reader - dmesg-warn - *ERROR* fifo underrun on pipe A
  - https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_249/fi-hsw-peppy/igt@i915_suspend@sysfs-reader.html

A CI Bug Log filter associated to this bug has been updated:

{- HSW: igt@i915_suspend@sysfs-reader - dmesg-warn - *ERROR* fifo underrun on pipe A -}
{+ HSW: all tests - dmesg-warn - *ERROR* fifo underrun on pipe A +}

New failures caught by the filter:

  * https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_282/fi-hsw-peppy/igt@kms_atomic_transition@plane-all-transition.html

This issue is seen every 2 runs and affected platform is HSW.
The FIFO underrun ERROR is only seen at the beginning after which the link training passes and underruns are not reported after that.

For 6 tests, it is seen every 2 runs, medium priority.

-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/drm/intel/issues/44.