After the fresh installation of Ubuntu 18.04 at Dell Latitude E6400 laptop its keyboard backlight worked. Nevertheless, after some updates (I do not know when) the keyboard backlight has stopped working. What I can do?



The following commands will help you check the backlight of your Dell Keyboard:

$ cat /sys/devices/platform/dell-laptop/leds/dell\:\:kbd_backlight/brightness

Above command will show the configured brightness

$ cat /sys/devices/platform/dell-laptop/leds/dell\:\:kbd_backlight/max_brightness

Above command will help you see the maximum brightness value.

$ echo 4 | sudo tee /sys/devices/platform/dell-laptop/leds/dell\:\:kbd_backlight/brightness

Above command will set the maximum keyboard backlight brightness.

You can set the Time_out to your keyboard backlight using the Following Tutorial:


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.