How to adjust the brightness of Display in Raspberry pi 3b+ with Ubuntu server

Hi all, please guide me on how I can adjust the brightness of the display. I am using Raspberry pi 3b+ with Ubuntu server 18.04. Since the Ubuntu server does not come with desktop UI.

Hi @ogra,

Can you help to achieve that?

This looks like a support request.

This site is for the co-ordination of the Ubuntu project(s), and other non-support matters. For Ubuntu Support options, please have a look at

Software brightness control (like xrandr --brightness) is currently broken on Raspberry Pi due to a kernel bug.

When that’s fixed it will probably only get fixed in Ubuntu 22.04. But even if that feature was working it’s not recommended due to reduced colour quality. You should ideally tweak brightness on the monitor itself.