Ubuntu – How to change brightness, color and sharpness from command line

brightnesscommand linedisplayxorg

I am controlling my PC with SSH and scripting. How can i change the brightness, color and sharpness from command line?

Try 1: failed

$ sudo redshift -t 5000:5000 -g .5
Cannot list GNOME panel applets.
Initialization of gnome-clock failed.
Trying next provider...
Latitude and longitude must be set.

Try 2: failed

$ cat brightness 
20
$ cat max_brightness 
20
$ echo 1 | sudo tee /sys/class/backlight/acpi_video0/brightness 
1
$ echo 20 | sudo tee /sys/class/backlight/acpi_video0/brightness

Any alternative way to do?

Follow up: http://jonls.dk/redshift/

[command]     [1000K to 10000K]       [effects 0.1 to 10.0]
|       |     /      /                /
^       ^     ^      ^                ^
redshift  -t  1000:1000   -l 0:0  -g .1; Dark
redshift  -t  1000:1000   -l 0.0  -g  5; Bright

Best Answer

If the driver of your graphics card supports it, then you can use xrandr.

The following command lists the current configuration:

xrandr --current --verbose

If you want to change the configuration of an output, then you need the name of the output. This name is part of the output of xrandr --current, for example LVDS1.

The brightness can be changed like this:

xrandr --output <outputname> --brightness 0.8

Gamma (red:green:blue):

xrandr --output <outputname> --gamma 0.5:1.0:1.0
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