I use HP Zbook 15 G5 (with hybrid graphic cards, an onboard Intel and a Radeon WX 3100)
I use the lts kernel and KDE with lddm.
When I use the laptop’s screen and then connect to an external display/docking station everything freezes.
I then restart and when the computer boots while in docking station the external displays work properly.
It makes it frustrating as it is a work computer and I can’t dock my laptop after a meeting without having a freeze-hard reboot cycle.
I’m quite a Linux newbie and I’m not even sure where to look for an error.