I’m running Ubuntu 19.10 (which ships a version of X that has the commits that allow render offloading) on a Lenovo Thinkpad X1 Extreme with a 1050 Ti Mobile (driver version 440.26 off of Ubuntu’s “graphics-drivers” ppa: https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa).
Render offload mode (seemingly called “Nvidia on-demand” in the Nvidia X server settings app) works great for the laptop’s screen.
But I am not able to use external displays on the render offload mode, only on “Nvidia” mode. In render offload mode, I can connect an external monitor to the laptop’s USB-C port and it appears in the Nvidia settings window but Ubuntu seems to not see it. The monitor acts like it is not receiving any signal. Is it possible to support external displays?