CONFIG_FB_BACKLIGHT (not configurable)

modulename: msm_fb_bl.ko

configname: CONFIG_FB_BACKLIGHT

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Support for frame buffer devices
└─>FB_BACKLIGHT
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
drivers/staging/msm/msm_fb_bl.c