kernelconfig_penguin
default or selected kernelversion does not have config value CONFIG_BACKLIGHT_LCD_SUPPORT.
Result is shown for kernelversion 5.9.8

Backlight & LCD device support

configname: CONFIG_BACKLIGHT_LCD_SUPPORT

Linux Kernel Configuration
└─> Device Drivers
└─> Graphics support
└─> Backlight & LCD device support

Enable this to be able to choose the drivers for controlling the
backlight and the LCD panel on some platforms, for example on PDAs.