Keyboard backlight

Asus

The keyboard backlight file is usually locked out from editing. To unlock this file at bootup, you will need to create a systemd service.

/usr/lib/systemd/system/asus-kbd-backlight.service
[Unit]
Description=Asus Keyboard Backlight
Wants=systemd-backlight@leds:asus::kbd_backlight.service
After=systemd-backlight@leds:asus::kbd_backlight.service

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/chmod 666 /sys/class/leds/asus::kbd_backlight/brightness

[Install]
WantedBy=multi-user.target

You are now able to use a keyboard backlight changer script. For an example, see ASUS G55VW#keyboard backlight script.