Been using a Pluggable UD3900 (displaylink chipset) for over two years without issues. Today, the video out stopped working. Checked all cables and tried a windows laptop - the dock is working as expected on Windows. Under 18.04 LTS with kernel 5.3.0-7625-generic, and Intel HD 620 onboard graphics, the usb display stopped working.
No external monitor detected, even with randr.
Any ideas?
Fixed. Something went horribly wrong with the odiaf ppa updates - I reinstalled the OS and Xorg is now working with the dock (multiple monitors) as expected.