Lenovo IdeaPad Laptop Extras

modulename: ideapad-laptop.ko

configname: CONFIG_IDEAPAD_LAPTOP

Linux Kernel Configuration
└─>Device Drivers
└─>X86 Platform Specific Device Drivers
└─>Lenovo IdeaPad Laptop Extras
In linux kernel since version 2.6.37 (release Date: 2011-01-04)  
This is a driver for Lenovo IdeaPad netbooks contains drivers for
rfkill switch, hotkey, fan control and backlight control.

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