DELL offers a backlit keyboard in its Laptop/Notebook which is an optional feature. But unlike Apple MacBook Pro, there is no sensor that can automatically turn on the backlit keyboard in dim light. Instead, you need to manually enable the backlit keyboard if you have it on your device. See how to do that –
To Turn On Backlit Keyboard in Dell laptops like Studio/Vostro/XPS/Latitude, “Hold the Fn key and press the Right Arrow key”. You can see all symbols illuminating on the keys. With the same hotkey, you can toggle between the three lighting states (in the given order). The lighting modes are full keyboard, half keyboard, and off.
Note: This only works if you have purchased the optional backlit keyboard while ordering. Studio Laptop with backlit keyboard have an additional icon for the LED on/off switch, which is located on the right arrow key.
Update: Thanks to the comments, below are the other hotkeys that you can try depending on your Dell laptop model.
Hold down Alt and press the F10 key
- Dell 14 Inspiron 7000
- Dell Inspiron 15
- Dell Inspiron 2016
- Dell Inspiron 17 5000 series
Hold down Fn and press the F10 key
- Dell Inspiron 15 5000 series (Or CTRL + F10)
- Dell Latitude E5550
- Dell Latitude E7450/ E7470 (Or Alt + F10)
Press F10 key
- Dell XPS 2016/ XPS 13
Press Fn + F6 key
- Dell Studio 15
NOTE: While pressing Fn or Alt, hit the F10 key 3 times to toggle between off, medium lit, and fully lit.