drm:intel_dp_start_link_train [i915] *ERROR* failed to enable link training
Submitted by Chris Murphy
Assigned to Intel GFX Bugs mailing list
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.
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 : 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.