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drm:intel_dp_start_link_train [i915] *ERROR* failed to enable link training

Submitted by Chris Murphy

Assigned to Intel GFX Bugs mailing list

Link to original bug (#109522)

Description

Summary: Often during wake from sleep there is a brief display flicker (black to GDM login screen, back to black for about 1s, back to GDM login screen), and also there is this error in red text found in dmesg/journalctl -k

Jan 31 08:37:41 flap.local kernel: [drm:intel_dp_start_link_train [i915]] ERROR failed to enable link training

The flicker is cosmetic. And I'm not sure if the red text is even related to the flicker.


Reproducible: 75%

Hardware:

HP Spectre (circa 2016), Firmware Version: F.42 Release Date: 10/25/2018, is current.

Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz

00:02.0 VGA compatible controller [0300]: Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07) (prog-if 00 [VGA controller])

External display: NEC MultiSync PA241W. Connection is USB-C Thunderbolt 3 to HDMI adapter, HDMI to DVI adapter, DVI cable to display.

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