Panasonic Laptop Extras

modulename: panasonic-laptop.ko

configname: CONFIG_PANASONIC_LAPTOP

Linux Kernel Configuration
└─>Device Drivers
└─>Misc devices
└─>Panasonic Laptop Extras
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
This driver adds support for access to backlight control and hotkeys
on Panasonic Let's Note laptops.

If you have a Panasonic Let's note laptop (such as the R1(N variant),
R2, R3, R5, T2, W2 and Y2 series), say Y.

source code: