MarsSeed [1] filed a deletion request for brightnessctl-logind [2]: Abandoned since 2019 and does not support systemd (logind).
But superseded by repo's brightnessctl which does: https://archlinux.org/packages/?name=brightnessctl [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/brightnessctl-logind/
