An X11 backlight manager.
To install it you will need a nightly Rust toolchain, then you can install it with Cargo:
cargo install dux
dux can be used like a replacement for
xbacklight, the command syntax changes
slightly but the functionality is the same (
with the usual fade settings).
To start the adaptive brightness daemon just run:
dux adaptive &
To stop it gracefully (making sure the settings are saved) just run:
Adaptive brightness manages the backlight automatically for you based on the selected mode and profile.
To select a mode you can either pass a
--mode <mode> when starting the
adaptive brightness, or call
dux mode <mode> after it's been started.
There's support for multiple profiles, to select a profile just pass
--profile <name> when starting the adaptive brightness, or call
dux profile <name>;
profiles are useful for example to have different settings during the night and
during the day, or when you're inside or outside.
To configure the brightness levels for the various modes all you have to do is
change the backlight from
dux itself like you would with
xbacklight and the
change will be saved. If you don't want to do that you can call
after changing the backlight with something else.
desktop mode uses the current active desktop (also known as workspace in
some window managers) to reload the previously set brightness.
window mode uses the active window to to reload the previously set
Tt uses both the window's instance and class name to determine the brightness, this allows for a common brightness setting for the class and a specific one for the named window.
luminance mode uses the screen content's contrast to reload the
When the luminance is between two different settings it will interpolate the brightness value between the two based on the distance between them.
For example if you have
10 luminance set at
80 brightness and
luminance set at
20 brightness and the current luminance value is
brightness will be closer to
Performance wise it uses some X extensions to avoid doing heavy work, it uses the MIT-SHM extension to avoid connection pressure when fetching the screen contents and the DAMAGE extension to only fetch and recalculate the areas that have actually changed.