default or selected kernelversion does not have config value CONFIG_BACKLIGHT_LCD_SUPPORT.
Result is shown for kernelversion 6.9.9
Backlight & LCD device support
configname: CONFIG_BACKLIGHT_LCD_SUPPORT
Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Backlight & LCD device support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)
Enable this to be able to choose the drivers for controlling the
backlight and the LCD panel on some platforms, for example on PDAs.
backlight and the LCD panel on some platforms, for example on PDAs.