|A number from 0 to 65535, where 0 means complete darkness, and 65535 means normal functioning - full brightness.|
A float number from 0.0 to 10.0, which gives the exponent used for
building the gamma ramp. The default is 1.0 (linear).
DISPLAY To get default host and display number.
Does not have display or screen arguments - set these via DISPLAY environment variable if necessary. Does not query brightness, only sets it. Does not play well with xgamma - xbrightness will erase xgammas settings and vice versa.
Asher Blum <email@example.com>
Jean-Daniel Pauget <firstname.lastname@example.org>
Written in January 2003 to use the recently added XF86VidModeSetGammaRamp function as an overall brightness control.
Additions in September 2005 in order to get some revival from a shifted LCD screen.