ACPIBUT(4) Device Drivers Manual ACPIBUT(4)

acpibut
ACPI Button

acpibut* at acpi?

The acpibut driver supports two kinds of ACPI buttons:
Button Script
/etc/powerd/scripts/power_button
/etc/powerd/scripts/sleep_button

When a button is pressed, the powerd(8) daemon, if running, will execute the corresponding script.

acpi(4), powerd(8)

The acpibut driver appeared in NetBSD 1.6.
April 25, 2010 NetBSD 9.4