[Bug 111502] Dell XPS15 (HD530 & GeForce 950) external screen via dock/HDMI no text display & gdm freeze

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111502

--- Comment #4 from HaJo Schatz <hajo at hajo.net> ---
Created attachment 145217
  --> https://bugs.freedesktop.org/attachment.cgi?id=145217&action=edit
drm-tip logs

Apologies, took a while to compile & run that. Result is the same failure, 2nd
display is dead. Attached are dmesg logs both with and without drm.debug
enabled of drm-tip cloned 2019-08-28, 18:30 UTC+8

Meanwhile I also noticed that the "defective" kernels/modules >5.0 configure
something in the dock(?) which subsequently makes the "working" kernels very
unstable. 
Seems like some register settings in the dock which do not get initialized by
the working kernels <= 5.0, so those then crash, don't serve dock-connected
HIDs, etc. Need to power-down the dock for an extended time (30mins+) to get
back to a stable hardware after one of the 5.1+ kernels ran.

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