After having a mostly functional TB16 dock with Preciiosn 5520 (Ubuntu 16.04), I'm back to a crippled system. I believe the culprit was the update to firmware 0.1.7.1. USB and networking are both broken... Any help with troubleshooting would be greatly appreciated.
Same for me. Had a perfectly working Dell 5520 + TB16 dock running Ubuntu 18.04. The firmware update has broken my external monitor. Ethernet etc are fine, it's just the external display via display port that won't work.