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The keyboard lighting doesn't work. I tried using "xset led on", but it doesn't work either. How can I fix this?

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Dell keyboard backlight files/properties are located in /sys/class/leds/dell:kbd_backlight in which file named brightness has integer value which determine state of keyboard backlight brightness. In my Dell laptop there are 3 states of keyboard backlight.

  1. To turn off:

    echo 0 | sudo tee /sys/class/leds/dell::kbd_backlight/brightness
    
  2. To turn on with low brightness:

    echo 1 | sudo tee /sys/class/leds/dell::kbd_backlight/brightness
    
  3. To turn on with full brightness:

    echo 2 | sudo tee /sys/class/leds/dell::kbd_backlight/brightness
    

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