ThinkPad T460p
Ubuntu 18.04 / Linux Mint 19
uname -a Linux deus-ex-machina 4.15.0-23-generic #25-Ubuntu SMP Wed May 23 
18:02:16 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Mate Desktop

Same problem.
If I boot with the dock, everything is fine.
If I unplug and plug it again, my external monitors are still black and my 
internal keyboad and the USB are not working.
But I get the message, that the ethernet cable is connected and that the laptop 
gets power.


I also tested 
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1552040/comments/14
 from Sergey Menshikov (sergem) 
After adding /usr/share/X11/xorg.conf.d/20-intel.conf my computer was unusable, 
stopping at the bootscreen, with the message
PKCS#7 signature not signed with a trusted key
Secure Boot is deactivated.

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https://bugs.launchpad.net/bugs/1552040

Title:
  Laptop sometimes doesn't detect external monitor

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