Same issue for me - worked flawlessly before
Same issue for me since about august - probably after an update of Ubuntu or Nvidia drivers, not sure though.
I'm on an Asus laptop.
Ubuntu 20.04
kernel 5.11.0-40-generic
Nvidia GeForce RTX 2070
Nvidia driver 470.82.00
Display Link Driver 5.4.1-55.174
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