[Bug 105998] [CI][SKL only] igt@* - dmesg-warn - *ERROR* failed to enable link training

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105998

--- Comment #3 from Chris Murphy <bugzilla at colorremedies.com> ---
Created attachment 141573
  --> https://bugs.freedesktop.org/attachment.cgi?id=141573&action=edit
dmesg, drm.debug=0xe

I'm seeing this on

00:02.0 VGA compatible controller [0300]: Intel Corporation Skylake GT2 [HD
Graphics 520] [8086:1916] (rev 07) (prog-if 00 [VGA controller])
        Subsystem: Hewlett-Packard Company Device [103c:81a0]


[12446.213836] f29h.local kernel: [drm:intel_dp_start_link_train [i915]]
*ERROR* failed to enable link training
[12446.213959] f29h.local kernel: [drm:intel_dp_start_link_train [i915]]
[CONNECTOR:79:DP-1] Link Training failed at link rate = 162000, lane count = 4
[12446.214211] f29h.local kernel: [drm:intel_dp_modeset_retry_work_fn [i915]]
[CONNECTOR:79:DP-1]


4.19.0-0.rc3.git2.1.fc30.x86_64 which is git 54eda9df17f3.


So far it's only happening on wake from S3, possibly the connected external
display itself hasn't come out of power save at the initial link training?
Subsequent link training appears to be OK.

On the primary display at about this time (hard to say), there is a flicker at
GDM (GNOME login). I can't tell if it's related.

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