linux: added display control

wiki/linux/display_control.md

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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.