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. While manipulating the keyboard is a straightforward process, many.
The keyboard and keys allow you to do everything from typing out emails to accessing your files. You can confirm the max value for brightness in a similar way: :/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight # cat max_brightness When it comes to interacting with your Dell computer, the Dell keyboard is arguably the most important component. 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 IMPORTANT: This is Dell laptops (if not Dell XPS model) specific. 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.
