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# brightnessctl
This program allows you read and control device brightness. Devices, by default, include backlight and LEDs (searched for in corresponding classes). If omitted, the first found device is selected.
It can also preserve current brightness before applying the operation (allowing for usecases like disabling backlight on lid close).
## Installation
The program is available in:
* [Fedora/EPEL](https://apps.fedoraproject.org/packages/brightnessctl)
* [Arch Linux (AUR)](https://aur.archlinux.org/packages/brightnessctl)
One can build and install the program using `make install`. Consult the Makefile for relevant build-time options.
## Permissions
Modifying brightness requires write permissions for device files. `brightnessctl` accomplishes this (without using `sudo`/`su`/etc.) by either of the following means:
1) installing `brightnessctl` as a suid binary (done by default)
2) installing relevant udev rules to add permissions to backlight class devices for users in `video` and leds for users in `input`.
The behavior is controlled by the `INSTALL_UDEV_RULES` flag (setting it to `1` installs the udev rules, `0` is the default value).
## Usage
```
Usage: brightnessctl [options] [operation] [value]
Options:
-l, --list list devices with available brightness controls.
-q, --quiet suppress output.
-p, --pretend do not perform write operations.
-m, --machine-readable produce machine-readable output.
-s, --save save previous state in a temporary file.
-r, --restore restore previous saved state.
-h, --help print this help.
-d, --device=DEVICE specify device name.
-c, --class=CLASS specify device class.
-V, --version print version and exit.
Operations:
i, info get device info.
g, get get current brightness of the device.
m, max get maximum brightness of the device.
s, set VALUE set brightness of the device.
Valid values:
specific value Example: 500
percentage value Example: 50%
specific delta Example: 50- or +10
percentage delta Example: 50%- or +10%
```
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