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# DDC/CI control database
Project `ddccontrol-db` contains database of monitor descriptors, which are used by `ddccontrol` and `gddccontrol` utilities to control monitor parameters using DDC/CI protocol.
* [Installation](#installation)
* [Installation from official packages](#installation-from-official-packages)
* [Installation from sources](#installation-from-sources)
* [Usage](#usage)
* [From GUI using gddccontrol](#from-gui-using-gddccontrol)
* [From command line using ddccontrol](#from-command-line-using-ddccontrol)
* [Contributing](#contributing)
* [License](#license)
## Installation
The most convenient way to install `ddccontrol-db` is to use packages from official distribution repositories.
Manual installation is more complicated, but contains latest monitor profiles.
### Installation from official packages
On Ubuntu based distrubtions `ddccontrol-db`, along with utilities, can be installed using `apt`:
```shell
sudo apt install ddccontrol ddccontrol-db gddccontrol
```
Instructions for other distributions will be prepared later.
### Installation from sources
Install build depedencies (on Ubuntu):
```shell
sudo apt install intltool libtool m4 automake autopoint
```
Instructions for dependecies installation will be prepared later.
Latest repository can be cloned and built by:
```shell
git clone https://github.com/ddccontrol/ddccontrol-db.git
cd ddccontrol-db
./autogen.sh
./configure --prefix=/usr/
make
```
Finally, the build can be installed using:
```shell
sudo make install
```
## Usage
Monitor database is used indirectly with `ddccontrol` and `gddccontrol` utilities.
### From GUI using gddccontrol
`gddccontrol` is a graphical utility for monitor configuration. It is called **Monitor Settings** in list of applications.
Currently, root privileges are required to control monitor parameters, therefore the launcher automatically asks for a password.
Utility can launched directly from commandline:
```shell
sudo gddccontrol
```
### From command line using ddccontrol
`ddccontrol` allows monitor configuration directly from commandline. To probe I2C devices to find monitor buses use:
```shell
sudo ddccontrol -p
```
To read value of control `0x10` (brightness on VESA compliant monitors) for device `dev:/dev/i2c-4`:
```shell
sudo ddccontrol -r 0x10 dev:/dev/i2c-4
```
To set value of control `0x10` (brightness on VESA compliant monitors) to `75` for device `dev:/dev/i2c-4`:
```shell
sudo ddccontrol -r 0x10 -w 75 dev:/dev/i2c-4
```
See `ddccontrol -h` for more information.
## Contributing
See [`doc/how-to-add-a-monitor.md`](doc/how-to-add-a-monitor.md) for a hands-on introduction on how to add a monitor.
## License
The project is licensed under `GNU General Public License v2.0` license. See [COPYING](COPYING) for details.
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