IMPORANT: you need to do it as root user. If you just echo the numeric value you want, it will immediately apply it to your laptop’s keyboard.

You can confirm the max value for brightness in a similar way: :/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight # cat max_brightness For example, Dell on Windows 10 offers keyboard backlighting settings. We are talking about the backlighting of the keys. Go to the /sys/devices/platform/dell-laptop/leds/dell::kbd_backlight directory and cat the file called brightess: :/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight # cat brightness To check if your laptop has a backlit keyboard, go to the support page on the. Some manufacturers like Dell, HP, Sony or Samsung include an interesting feature on their keyboards. IMPORTANT: This is Dell laptops (if not Dell XPS model) specific. For instance, Dell Windows 10 laptops offer settings to turn on or off the backlit keyboard, adjust the keyboard brightness, automatically turn off the backlight after 5/10/30/60/300 seconds of inactivity.

I didn’t take me long to start wondering if there was a way to control keyboard backlight on my Dell XPS 3890 laptop, and of course there is a simple enough solution.

Dell keyboard backlight settings