Well,
I kept plugging away and stumbled into the solution...
For anyone that's interested:
- I uninstalled the three evdi related packages via apt (evdi-dkms, libevdi0, and libevdi0-dev). (They're a red herring.)
- I downloaded the Legacy Driver 'DisplayLink USB Graphics Software for Ubuntu6.0-EXE.zip' from https://www.synaptics.com/products/d...wnloads/ubuntu
- I then unzipped it, made the .run file executable, and ran it with sudo.
That's all it took and my USB3 docking station works on my (stable) Debian 12 box.