Distro: Pop!_OS 20.04 (gnome)
With the existing gpu-manager selection of hybrid mode, I was able to plug in a display to the ports hardwired to the nvidia chip, and everything seemed fine except for the fact that my ultrawide would not display a clear picture, it looked like the old CRT refresh rate too high scrambled picture.
When I bumped the resolution down a notch everything seemed okay, except for the fact that the two screens were acting like one big screen surface instead of two individual screens.
When I followed the guide in the README for reverse-prime I was unable to start X unless I had the external screen plugged in (otherwise no screen found error), or I had to add “AllowEmptyInitialConfiguration” to the conf. However once I went this route sure it worked, but, it worked like I was using standard PRIME mode and the driver never allowed powersaving.
What is the correct way to set this up, and what is the precise expected behaviour when used with a laptop that has the external outputs wired to the Nvidia GPU?