Ubuntu 16.04 no functionality

[ThaHypnotoad]

I'm plugging it in, seeing the monitor power on (this is one of the usb powered ones) and getting nothing. DisplayLink is showing up in lsusb, but nothing on the display itself, and nothing in the displays settings window.

edit: Everything worked for a year. This started happening when my original monitor stopped powering on and I had to rma it, but numerous things happened between when the original broke and when I got the replacement, so I can't narrow it down to any specific change in my system.