CONFIG_LCD_BACKLIGHT is not available for thedefaultarchitecture x86.
Result is shown for architecture unicore32

LCD Backlight support

configname: CONFIG_LCD_BACKLIGHT

Linux Kernel Configuration
└─>PKUnity NetBook-0916 Features
└─>LCD Backlight support
In linux kernel since version 2.6.39 (release Date: 2011-05-18)