In the middle of the desert you can say anything you want

12 Jan 2022

Changing screen brightness on linux, on hardware and software level

Connected an external screen, it was dark, googled for a solution after resetting redshift settings didn’t work.

So, there are a lot of ways to change brightness (SO1).

xbacklight works with hardware-level brightness for the devices that support it.

For the others, software-level changing of gamma values is what’s usually needed, and what I did with a lot of different programs before. This worked this time:

xrandr --output LVDS1 --brightness 0.5

(As a bonus, it uses the already well-know and well-loved xrandr.)

Sad that arandr can’t do brightness though, but there are reasons (missing –brightness features (#35) · Issues · arandr / ARandR · GitLab)

From there I learned that ddcondrol is the way to change brightness for external monitors on hardware level, and that Jolmberg/wmbright: Monitor brightness control dockapp is a back-end that tries to do everything.

  1. How to change LCD brightness from command line (or via script)? - Ask Ubuntu ↩︎

Nel mezzo del deserto posso dire tutto quello che voglio.