ddcutil VS Clight

Apologies. I hate when people do that as well.

In addition to the other links posted, ddcutil.org has some more good info: https://www.ddcutil.com/#introduction

Sous Linux j'avais utilisé ddcutil

Most monitors have a Virtual Control Panel (VCP), which implements features defined in the Monitor Control Command Set (MCCS). This is a VESA standard. You can find the Input selection command in table 8-10. You send these commands over an I2C bus called Display Data Channel/Command Interface which is yet another VESA standard. If you are running Windows https://www.nirsoft.net/utils/control_my_monitor.html will let you use every VCP feature your monitor has. For Linux, https://www.ddcutil.com/ does this. For Mac, https://github.com/alin23/Lunar

The protocol is called DDC , it's a VESA standard. In there, it's called VCP features. If you are running Windows https://www.nirsoft.net/utils/control_my_monitor.html will let you use every VCP feature your monitor has. For Linux, https://www.ddcutil.com/ does this. For Mac, https://github.com/alin23/Lunar note how all three mention input selection.

ddcutil (a command-line tool, and what most UI tools are based on)

A related non rust tool (that also has an optional GUI) is ddcutil. How does this compare to that?

I've also used ddcui: https://www.ddcutil.com/#introduction, available as an AUR package: https://github.com/rockowitz/ddcutil. This has a nice GUI: https://www.ddcutil.com/screenshots/ddcui_features.png and works on everything I've tried it on out of the box.

There is also Clight (https://github.com/FedeDP/Clight) if you want automatic backlight adjusting given ambient brightness. It supports external monitors through ddcutil C library and has many more features to offer.

Here are two suggestions from the Arch Wiki, try Clight or macbook-lighter. Clight looks to be continuously maintained, so I'd try that one first.

Clight can do that. See the config file.

Installed light, clight, clightd and acpilight

If you're using a laptop screen, there's Clight, which can turn your webcam into an ambient light sensor.

Clight is a lightweight C user daemon utility program that turns your webcam into a light sensor which it depends on to automatically adjust your screen’s display based on ambient light. Just like Redshift, Clight can manipulate the temperature of your screen and it derived inspiration from Calise.

Check out Clight. There's also a GUI for it.

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.