Dell Inspiron 23 (2350, Mid 2013) - Manual (Page 101)

Display-Settings Controls
Use the display settings controls to:
• adjust volume
• adjust screen brightness
• select video source
• turn off the display
The functions of the controls vary when:
• your computer is not connected to any video input or video output
devices
• your computer is connected to an external video input device such as an
another computer, gaming console, camera, Blu-ray player, and so on
• your computer is connected to an external video output device such as a
TV, monitor, projector, and so on
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