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[shapeshifter@tachychineta shapeshifter]$ cat /usr/lib/systemd/system/asus-screen-brightness.service 
[Unit]
Description=Allow user access to screen brightness
After=systemd-udevd.service

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/bin/asus-screen-brightness allowusers
ExecStart=/usr/bin/asus-screen-brightness 800
ExecStop=/usr/bin/asus-screen-brightness disallowusers

[Install]
WantedBy=multi-user.target