Bug 102392

Summary:	[BAT] igt@kms_flip@basic-flip-* kill the machine when connected to a DP MST screen
Product:	DRI	Reporter:	Martin Peres <martin.peres>
Component:	DRM/Intel	Assignee:	Manasi <manasi.d.navare>
Status:	CLOSED WORKSFORME	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	critical
Priority:	high	CC:	intel-gfx-bugs
Version:	XOrg git
Hardware:	Other
OS:	All
Whiteboard:	ReadyForDev
i915 platform:	KBL	i915 features:	display/DP MST

Description Martin Peres 2017-08-24 15:31:10 UTC

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/

Comment 1 Tomi Sarvela 2017-08-25 07:28:57 UTC

Couldn't be reproduced on desktop KBL.

Comment 2 Tomi Sarvela 2017-08-25 07:48:46 UTC

Couldn't be reproduced with kbl-7560u with different DP-MST capable monitor. So, the specific model Dell U2515Hc plays a part here.

Comment 3 Dhinakaran Pandiyan 2017-08-25 21:32:54 UTC

Does this https://patchwork.freedesktop.org/series/28667/ help?

Comment 4 Jani Saarinen 2017-09-01 08:49:32 UTC

Screen was changed and no issues seen. Patch to be tested but not highest currently

Comment 5 Elizabeth 2017-09-07 14:44:54 UTC

I think this could be a duplicated of bug 96226.

Comment 6 Marta Löfstedt 2017-11-01 13:41:41 UTC

Never seen again. Closing

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