I have an RTX 2070 Super video card running on Ubuntu 20.04 whose USB-C output is connected to my UD-ULTCDL triple monitor dock.
This is exact setup works well in Windows 10 and drives my three monitors properly with the main large 43" one in landscape mode and a 24" on each side in portrait mode.
In Ubuntu not so much with 440.100 NVidia drivers (Ubuntu supplied) and the DisplayLink driver 188.8.131.52 from DisplayLink.
The centre screen is fine but the side ones have issues. First problem is there’s keyboard input lag within the satellite monitor windows when I make one of them active by clicking on them but the far bigger problem is the way the mouse moves.
After moving the mouse pointer into either screen, it jumps past part of the screen making that portion unusable. It’s only a small amount for the right hand one screen but a full 20% of the left one which is not workable. A phantom pointer also remains in each of the side screens when the mouse is returned back into the centre screen.
This behaviour doesn’t occur when the side screens are in landscape mode (at least no phantom or unusable screen) but changing their orientation to side step the issue I’m having is not really a good option as I’m tight for space given the monitor sizes plus I intentionally bought a large centre one whose height matched the width of the side ones so the mouse would transition between the screens well.
I noticed there’s a DisplayLink forum posting about a patched XServer which I tried but that didn’t correct the problem so I ended up reverting that and am not sure what to try next as I’m quite new to Ubuntu and would really like to get this working.
I see from other forum posts here that DisplayLink is not officially supported by Plugable but would appreciate any ideas that anyone in the community might have.
I also posted this to the same DisplayLink forum here with screenshots of how things are configured.