Q: Why are my extended display black when I use a MacBook laptop with my Displaylink adapter/Docking station?
DisplayLink powered USB video adapters and docking stations are not compatible with any
MacBook running macOS 10.13.4 - 10.13.6. If a system has updated to macOS 10.13.4, 10.13.5, or
10.13.6, upgrading to macOS 10.14 (Mojave) is an option for users to restore DisplayLink
Now, DisplayLink compatibility issue also affects any 2018 MacBook Pro laptops with an Intel
Coffee Lake CPU running macOS 10.14. Please see the DisplayLink site for a driver download
workaround. This workaround will force AirPlay to extend or mirror one USB display.