Hi again! I just discovered that this issue goes away if I use the usb-c/tb3-port on the RIGHT side of the laptop instead of the left side. Really strange. But this works for me.
I'm running Ubuntu 19.10 on a Dell XPS 13 7390 2-in-1. I'm using the WD19TB dock to connect 2 external displays. Everything works except for the fact that my OS only detects 1 external display and mirrors the output to both external displays. I've updated the dock and laptop firmware the latest versions. I suspected a newer kernel might solve the issue but booting a 5.4 kernel didn't change anything. Both displays are detected on Windows. Any ideas how this can be resolved?
WD19TB Dock mirrors 2 external displays instead of extending on Linux