kate (an editor) is installed ?
then you’ll need to edit the grub and mkinitcpio with sudo rights. if you use kate you’re simply asked for sudo-passwd at saving.
edit /etc/default/grub and add
nvidia_drm.modeset=1
to the existing
GRUB_CMDLINE_LINUX_DEFAULT="
edit /ect/mkinitcpio.conf
MODULES=(nvidia_modeset nvidia_uvm nvidia_drm)
run
sudo mkinitcpio -P
sudo update-grub
done ? we can proceed with the next steps if succesful edited.