Here’s an example with Linux Mint 22.2. Other Linux Distros are probably very similar. OpenRGB is installed with FlatPak which is probably the simplest way to install it.
It’s pretty simple to start OpenRGB to light up your Keyboard or other things when you boot linux. Just enter a startup command in the Startup

I found this command by examining the short cut that flatpack produced when I installed it. Just add the –profile option to load your particular profile.
Enjoy,
:ww