LED backlight Trigger

modulename: ledtrig-backlight.ko

configname: CONFIG_LEDS_TRIGGER_BACKLIGHT

Linux Kernel Configuration
└─>Device Drivers
└─>LED Support
└─>LED Trigger support
└─>LED backlight Trigger
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
This allows LEDs to be controlled as a backlight device: they
turn off and on when the display is blanked and unblanked.

If unsure, say N.

source code: