The tests igt@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/
Couldn't be reproduced on desktop KBL.
Couldn't be reproduced with kbl-7560u with different DP-MST capable monitor. So, the specific model Dell U2515Hc plays a part here.
Does this https://patchwork.freedesktop.org/series/28667/ help?
Screen was changed and no issues seen. Patch to be tested but not highest currently
I think this could be a duplicated of bug 96226.
Never seen again. Closing
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