I believe the concept is the same as Intel iGPU with NVIDIA dGPU (open-source drivers on iGPU), and there’s an official method to have on-demand GPU selection with the proprietary NV GPU (prime render offload maybe?). I preferred this a lot more than the default run-everything-always-on-NVIDIA-GPU method, and that prime render offload option worked basically the same as DRI_PRIME with all open-source drivers.
I haven’t tried it in years, but I think NV in driver notes has a xorg.conf snippet that was copy/paste into oS TW no problem. You’d install the NV driver and likely start with the render-only-on-NV method, do xorg.conf, and then reboot to the gpu-select method. I don’t believe it was Intel-specific, but you can likely replace intel with amdgpu if it’s mentioned.
@bionic Look at using switcherooctl? I ran AMD RX550 and Nvidia GPU’s as Prime Render Offload. I only need the AMD gpu to run my displays… Now this is on GNOME with dbus integration of switcherooctl, don’t think Plasma has that yet, so you have to run manually.
No Xorg or Wayland configuration should be necessary. I have two Nvidia GPU’s running on Xorg without any configuration on GNOME, I also have Aeon running on a dual AMD gpu laptop with switcherooctl running fine…