My laptop is a Fujitsu Lifebook P2110. I get ACPI events for the function keys for video (switch to other video adapter. or S-output, or shrink the screen). The Method that gets called is \_GPE._L03. I know that the ACPI portion of the kernel is handling the method, but how do I register my own handler so I may generate acpid events? It's not obvious to me there's a device (_HID) associated with this method, and I don't see a precedent for this within the other drivers in drivers/acpi.