Dell Laptop Extras (EXPERIMENTAL)

modulename: dell-laptop.ko

configname: CONFIG_DELL_LAPTOP

Linux Kernel Configuration
└─>Device Drivers
└─>Misc devices
└─>Dell Laptop Extras (EXPERIMENTAL)
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
This driver adds support for rfkill and backlight control to Dell
laptops.

source code:
drivers/platform/x86/dell-laptop.c