Score:0

Lag with dual external monitors when primary display disabled on 22.04

ng flag
Ben

The setup ran fine (18.04) before my upgrade to 22.04.

It is a Lenovo Thinkpad with a DisplayLink USB-C dock with two external monitors connected.

Nvidia info: TU117GLM [Quadro T2000 Mobile / Max-Q]

With all three displays enabled, the performance is normal, but disabling the primary display leads to severe performance drop / screen lag. The primary needs to be disabled or windows sometimes spawn there, and there is no desk space for all three.

Things already attempted:

  • different versions of nvidia drivers (currently using 470, as it worked in 18.04, and 525/525-open weren't working well)
  • enabling/disabling wayland
  • gdm3/lightdm
  • reducing external resolution
  • synaptic displaylink drivers
Score:0
ng flag
Ben

It isn't perfect, but 515 (non-open) with reduced resolution provides adequate performance.

I sit in a Tesla and translated this thread with Ai:

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