Switching to Nvidia drivers from Nouveau with mhwd fails

sudo mhwd -r pci video-linux
then
sudo mhwd -i pci video-nvidia

On gnome you might have to enable early kms. As administrator edit the /etc/mkinitcpio.conf and make the MODULES= line like this

MODULES=(nvidia nvidia_modeset nvidia_uvm nvidia_drm)

then run from terminal:
sudo mkinitcpio -P
sudo update-grub

Also, you probably have autologin on and is trying wayland session and not always starts (at least on my end does funky things)

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