FedeDP/Clight is an open source project licensed under GNU General Public License v3.0 only which is an OSI approved license.
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Query and change Linux monitor settings using DDC/CI and USB
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Qt GUI for clight
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Control the brightness of backlight and keyboard LED devices on Linux. (read only mirror)
Automatic screen brightness
reddit.com/r/System76 | 2021-04-17
Check out Clight. There's also a GUI for it.
Clight Uses Your Webcam To Adjust Screen Backlight Based On Ambient Brightness.
reddit.com/r/LinuxOverdose | 2021-02-05
The only downside to Clight? You need to build not only Clight and Clightd from source, but also 2 dependencies (libmodule and ddcutil), as well as the Clight-GUI if you want to use it. That is, unless you use Arch Linux / Manjaro (there are AUR packages available), NixOS, Exherbo or Void Linux, for which there are packages available.
How to install something when there's no package?
reddit.com/r/linux4noobs | 2021-02-01
This is not hard to do - the instructions are there - just follow this guide. Every command you need to type is written
DDC/CI monitor control on Linux
reddit.com/r/linux | 2021-01-31
Or you can use Clight (disclaimer, i am the author!) and let it do the magic for you :) It uses ddcutil C library to support external monitors too.
converting webcam input to solid color desktop background in GNOME. Could be your shirt! (sorry for screen glare)
reddit.com/r/linux | 2021-01-19
Clight (and others, actually) does exactly this https://github.com/FedeDP/Clight
Dasung just released a 25 inch eInk monitor
news.ycombinator.com | 2020-12-25
This approach sounds similar to clight, which uses a webcam to adjust backlight levels (so may be a little less fidgety than using a color calibration sensor): https://github.com/FedeDP/Clight