The setmon CLI tool is used to set LCD monitor brightness.
Make sure Rust is installed before you attempt to install this utility. Then, use the following command.
cargo install setmon
The following command will enumerate all attached displays. Decide which monitor ID you want to set the brightness for, and use it in the next command.
setmon list
The setmon set command updates the brightness, for the specified monitor ID, to the value 0 - 100.
setmon set <monitor_id> <brightness>
MIT - 2023 Trevor Sullivan