Black screen on main laptop screen after installing Nvidia driver

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Thanks, it works as wanted. I would buy you a drink if I could ;)

Only bemol: as you can see in the attached screenshot - at some boots but not all boots - the lightdm login window is divided in three “small window” (I have a 4K laptop monitor and two 1080p external monitors). Is there a way to fix this ugly login window?

To sum up what I have done to resolve the initial problem:

1. Delete the Xorg conf file:

rm /etc/X11/xorg.conf

2. Configure the Display Manager to use Nvidia GPU only. In my example below, it’s LightDM but you can find the instruction for the other display managers in NVIDIA Optimus#Display_managers from Arch Linux doc.
   Create the following file /etc/lightdm/display_setup.sh and add:

xrandr --setprovideroutputsource modesetting NVIDIA-0
xrandr --auto

3. Create the Nvidia configuration file /etc/X11/xorg.conf.d/10-nvidia-primary.conf and add:

Section "OutputClass"
    Identifier "nvidia"
    MatchDriver "nvidia-drm"
    Driver "nvidia"
    Option "PrimaryGpu" "yes"
    Option "AllowEmptyInitialConfiguration" "true"
EndSection