DEBIAN xrandr The X Resize, Rotate and Reflect Extension (RandR)

$xrandr | grep connected
VGA-0 connected 1024x768+0+0 (normal left inverted right x axis y axis) 340mm x 270mm
$xrandr --output VGA-0 --brightness 1
$xrandr --output VGA-0 --brightness 0.5
$

Theory Drop
The X Resize, Rotate and Reflect Extension (RandR)[2] is an X Window System extension, which allows clients to dynamically change X screens, so as to resize, rotate and reflect the root window of a screen.

source:http://en.wikipedia.org/wiki/RandR

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