Test on Fedora 30

[jeffshee]

OS: Fedora 30 (Gnome 3.32.2)
CPU: Intel i5-6200U
GPU: NVIDIA GTX 950M

nvidia-prime-select intel is working fine. nvidia-smi report GPU-Util as 0 constantly. (Which I think it means the GPU is OFF?)

nvidia-prime-select nvidia isn't working. Couldn't login to the Gnome. Could it be a problem of GDM?

nvidia-prime-select default is working fine tho. It brings NVIDIA back as well. So why not:
nvidia-prime-select intel to switch to Intel
nvidia-prime-select default to switch to NVIDIA

What is the different between default and nvidia ?

[wildtruc]

Well, 'default' is to reset to default values of the laptop: basic system intel. it's like an emergency command.
I don't think to set nvidia as "default" entry is a good idea, because nvidia is surely not the default device and with incoming 'offload' option, this could confuse the user.

For GDM, yes, it could be. I though this issue were solved, but it doesn't looks like.
Install 'lightdm' and use it as session launcher. I'll will try to figure out what the problem with GDM.

I can't tell how many time it will take. i will post here when fix will be found.