View source for Adjust the Display With xgamma and xrandr

Sadly, this page is just copied from the Linux [[How Do I: A Linux Q&A]] page for now.  Details on these commands will be added in the future.

== [DISPLAY RESOLUTIONS AVAILABLE FOR MONITOR OR SET FROM COMMAND LINE] ==
Use the xrandr command.   Xrandr is used to set the size, orientation and/or reflection of the outputs for a screen. It can also set the screen size.

If you type 'xrandr' and ENTER you will see info about your current display.  See if you are using something like VGA-1, DVI-0, HDMI-1, DP-1, etc etc <- examples only

DO NOT TYPE: xgamma --output VGA-1 --brightness 0 (substitute VGA-1) for your display, this will make your screen black and you will see nothing.  Here is a working example:
 xrandr --output VGA-1 --brightness 0.75
Learn more
 man xrandr

== [ADJUST DISPLAY CONTRAST AND TINT FROM COMMAND LINE] ==
You can [[Adjust the Display With xgamma and xrandr]] from the command line.  See xrandr above.
 xrandr --output VGA-1 --gamma 1:1:1

Use the xgamma command.  A gamma value of 1.0 is the default.  A gamma value of 0.8 would give you more contrast.  A value of 1.4 would be much less contrast.  Example usage:
 xgamma -gamma 0.8
xgamma - Alter a monitor's gamma correction through the X server.  The gamma correction can either be defined as a single value, or separately for the red, green and blue components.  Also: -rgamma -ggamma -bgamma

Learn more
 man xgamma


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