einfach die entsprechenden acpi module aktivieren:
=>
http://tlug.up.ac.za/guides/lkcg/drivers_acpi.html
Button ACPI_BUTTON
Default: M
This driver registers for events based on buttons, such as the power, sleep, and lid switch. In the future, a daemon will read /proc/acpi/event and perform user-defined actions such as shutting down the system. Until then, you can cat it, and see output when a button is pressed.