Lumactl

lumactl is a tool to control the brightness on Linux. It supports both backlight brightness and external displays controlled with DDC protocol. The scope is unifying both interfaces under one tool, making it possible to use as interface for other tools like window managers and bars.

Features

• Supports backlight brightness
• Supports for external monitors via DDC
• Easy to use command line interface
• Supports for relative increase/decreases
• Designed to be fast

Dependencies

lumactl doesn't have any build time dependency, other than a working Rust compiler and toolchain. At runtime, it uses wmctl to get the current available displays, if the display argument hasn't been passed to it. wmctl currently only supports Wayland, but lumactl works with any display as long as you hard-code its name (i.e. DP-4, eDP-1 or HDMI-A-1, refer to your current window manager documentation on how to get the mentioned information).

Getting started

To build lumactl local, run:

$ cargo build --release

You can control the brightness by calling lumactl:

# Get the brightness in percentage for all displays
$ lumactl get --percentage
# Set the brightness to 100 for all displays
$ lumactl set 100
# Decrease the brightness for display DP-4 by 20%
$ lumactl set --display DP-4 -20%

License

lumactl is licensed under the GPL-3.0+ license.