(node:8987) UnhandledPromiseRejectionWarning: Unhandled promise rejectio n (rejection id: 1): Error: No backlight device found about brightness HOT 5 CLOSED

Please update the module to the latest node.js with catch()

from brightness.

Error: No backlight device found

Using the CLI or the regular API? Anyway, you can see why it fails in the error message.

Please update the module to the latest node.js with catch()

You should catch errors yourself.

from brightness.

Try running ls /sys/class/backlight. Does it list anything?

from brightness.

Nothing. But i installed backlight using apt-get install xbacklight . It still says no backlight device found.

from brightness.

What distro are you running? And I assume you can change brightness otherwise?

from brightness.