[Bug 102392] New: [BAT][KBL] igt at kms_flip@basic-flip-* kill the machine when connected to a DP MST screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102392

            Bug ID: 102392
           Summary: [BAT][KBL] igt at kms_flip@basic-flip-* kill the machine
                    when connected to a DP MST screen
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: martin.peres at free.fr
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

The tests igt at kms_flip@basic-flip-*, when executed on fi-kbl-7560u, generated
the following dmesg errors before completely hanging the machine:

[  518.181177] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[  526.414476] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe C FIFO underrun
[  534.652395] [drm:intel_mst_enable_dp [i915]] *ERROR* Timed out waiting for
ACT sent
[  534.697904] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe C FIFO underrun
[  543.029578] [drm:intel_dp_set_idle_link_train [i915]] *ERROR* Timed out
waiting for DP idle patterns
[  543.073515] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[  551.408384] [drm:intel_mst_enable_dp [i915]] *ERROR* Timed out waiting for
ACT sent
[  551.419261] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun

Full logs: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_5484/

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