This file is indexed.

/etc/acpi/events/asus-keyboard-backlight-up is in acpi-support 0.142.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# /etc/acpi/events/asus-keyboard-backlight-up
# This is called when the user presses the key brightness 
# up button and calls /etc/acpi/asus-keyboard-backlight.sh for
# further processing.

event=hotkey ATKD 000000c4
action=/etc/acpi/asus-keyboard-backlight.sh up