[Bug 107543] Video cutout on Kaby Lake U processors.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107543

--- Comment #69 from Anshuman Gupta <anshuman.gupta at intel.com> ---
(In reply to Jack Vickeridge from comment #58)
> Created attachment 142803 [details]
> Output from dmesg during same crash

Hi Jack,

Based on Weston attached logs there is mode set failure,

[16:59:21.321] set mode failed: Invalid argument
------------------------------------------------
[16:59:23.139] set mode failed: Invalid argument 

Around the same timestamp, DP link training failed in i915 driver

[  454.995631] [drm:intel_dp_start_link_train [i915]] [CONNECTOR:71:DP-1] Link
Training failed at link rate = 540000, lane count = 4
----------------------------------------------------- 
[  456.812422] [drm:intel_dp_start_link_train [i915]] [CONNECTOR:71:DP-1] Link
Training failed at link rate = 540000, lane count = 4

Looks like wiggling DP port is not handled by i915 driver properly and resulted
in DP Link training failure.

This failure is not due to the provided Workaround patch, you can raise a
separate bug for this mode set failure.

Thanks,
Anshuman Gupta.

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