[Bug 109522] New: drm:intel_dp_start_link_train [i915] *ERROR* failed to enable link training

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109522

            Bug ID: 109522
           Summary: drm:intel_dp_start_link_train [i915] *ERROR* failed to
                    enable link training
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: bugzilla at colorremedies.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

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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