The external monitor problem is probably a well-known gdm3 bug: gdm3
with nvidia modeset=1 stops the nvidia driver from detecting external
monitors (possibly it invokes some wayland features when it shouldn't).
It is not a problem with nvidia-prime or with the kernel. You can fix it
by using lightdm instead of gdm3. This bug affects fedora as well.

ubuntu 19.04 has reverted to nvidia modeset = 0 be default to avoid this
bug (at the cost of unfixable screen tearing for Optimus users in nvidia
mode).

nvidia-prime does always include the nvidia modules in the initramfs
kernel, this was a change in 18.10 backported to 18.04. Previous nvidia-
prime pacakges used to rebuild initramfs to add or remove the module,
but this is not required any longer. Choosing prime-select intel means
the nvidia module is unloaded when the machine is starting.

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https://bugs.launchpad.net/bugs/1798708

Title:
  It will load nvidia driver when swith to Intel mode

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