Laptop lcd screen is too too bright. disturbs me

[Kresimir]

@mdoverl

sudo pacman -S pamac-aur-git

This will not work, because pacman is not an AUR helper.
Read this:

[FAQ] What is the AUR?

The Arch User Repository (AUR) is a collection of user-submitted package description files ( PKGBUILD files). These description files can be used to create package archive files ( .pkg.tar.zst files). These PKGBUILD files can be used by an AUR helper (e.g. yay , aurman , Pamac) or manually built using makepkg. The resulting package archive file can then be installed in the normal way. All content on the AUR is uploaded by ordinary users and very little checking of their content is done - it is…

And it’s a good idea to at least skim through this:
https://wiki.archlinux.org/index.php/Arch_User_Repository