ddcci-driver-linux VS input-remapper

There is an out-of-tree kernel module that exposes the DDC-CI interface as a regular brightness control, so any laptop-oriented brightness control tool will work afterwards.

Those tools use the kernel backlight system, which doesn't support external monitors out of the box. It's the same with Xorg. You can get the ddcci-backlight driver: https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux/

To add to this: if you install ddcci-driver-linux GNOME should be able to control your brightness again. This removes the need for any extensions, and it's what I've been using for my monitor for the last few years.

There is an out of tree kernel module doing just that (integrating ddc/ci, the control channel for external monitor*, with the backlight system). And someone is working on upstreaming it

This is kinda a self promotion but for the brightness issue https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux may fix it. Or https://gitlab.com/YusufKhanAbdulHalim/ddcci-driver-linux/-/tree/master may fix it(if the first one doesnt work use the second one).

There is an unofficial Linux kernel module that allows userspace control of brightness (in a similar way to how laptop brightness is controllable):

https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux

I got my G29 working, but I am using a T-LCM which isn't correctly recognized. I installed Input Remapper but it's not recognized.

Perhaps GitHub - sezanzeb/input-remapper: 🎮 ⌨ An easy to use tool to change the behaviour of your input devices. will do?

OK, I will byte, have you tried Input Remapper[1] ?

I think most of your problem is coming from using Rocky Linux, it is much easier to find support on Ubuntu derivatives for tools made by the community in general.

[1] https://github.com/sezanzeb/input-remapper

- Input Remapper: Custom hotkeys & remapping of keys (with Wayland support)

Then you can use something like input-remapper to do whatever you want.

Ask upstream?

However I want my system to be automatically remapped at boot. Input Remapper installs a systemd service by default and I found that someone wrote an OpenRC init script for it, so I created a file called input-remapper in etc/init.d, copied the text of the script into it, saved it, then used chmod +x on it, so it has the same attributes as other init scripts.