/etc/acpi/events/asus-video is in acpi-support 0.140.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # /etc/acpi/events/asus-video
# This is called when the user presses the video button.
event=hotkey (ATKD|HOTK) 0000006[123]
action=/etc/acpi/videobtn.sh
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