Also the switch between the monitors does not work very well. I get
something working by pressing frenetically the "switch screens" Fn
button. And my options are not remembered (just external monitor when
docked, just internal when undocked).

My work around was to make two scripts:
/usr/bin/xrandr -d :0.0 --verbose|grep " connected" ; /usr/bin/xrandr -d :0.0 
--output DP2-2 --off --output eDP1 --auto

and:
/usr/bin/xrandr -d :0.0 --verbose|grep " connected" ; /usr/bin/xrandr -d :0.0 
--output DP2-2 --auto --output eDP1 --off

And bind these to some key combination. The problem is that sometimes my
X11 session crashes, and that does not feel to fluffy.

P.S. I do that printout intentionally. I takes time for the external
monitor to be detected. It seemed that when I did that printout it made
the external monitor be detected quicker.

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https://bugs.launchpad.net/bugs/1651454

Title:
  [Lenovo Thinkpad T460p] Ultra Dock external displays not detected
  after suspend/resume cycle

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