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linux: added display control

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# Display Control
Display control describes the process of controlling the display with means other than the hardware
buttons.
## DDC
DDC - short for Display Data Channel - is a specific way to control the display.
On [Linux](/wiki/linux.md)-based Systems this can be achieved by using the `ddcutil` command line
interface that can be found in the package of the same name.
For a graphical user interface `ddcui` can be used.
After installation it is possible that the system needs to be restarted due to the i2c-dev kernel
module.