Whenever I connect my MBP to an external monitor via a DisplayPort cable the OS pretty much locks up.
I have a new 2020 13" MBP running Catalina 10.15.5 (19F101). I'm trying to connect it to an external monitor via a Caldigit USB-C Pro dock and a 6ft DisplayPort <-> DisplayPort cable. When I connect the cable to the external monitor the laptop freezes for about 10-20 seconds, then the display updates momentarily, then freezes for another 10-20 seconds, then updates, and so on. The external monitor says it's not getting a signal. If I unplug the DisplayPort cable (either at the dock or at the monitor) then the laptop goes back to normal after a few seconds.
What can I do to diagnose this issue further? I've tried running Activity Monitor and I don't see any noticeable spikes in resource utilization.
I thought maybe the issue was with the cable - perhaps I need an "active" cable rather than a "passive" - but the Caldigit documentation only says that's necessary for an adapter (i.e. DisplayPort to HDMI).