Com xrandr , você pode afetar o gama e o brilho de uma exibição alterando os valores RGB.
De man xrandr :
-
%código%
Multiply the gamma values on the crtc currently attached to the output to specified floating value. Useful for overly bright or overly dim outputs. However, this is a software only modification, if your hardware has support to actually change the brightness, you will probably prefer to use
xbacklight.
xrandr --output DVI-1 --brightness .7
Existe também o pacote --brightness , que faz muito do mesmo, mas ...
-
%código%:
Note that the
xgammautility is obsolete and deficient,xrandrshould be used with drivers that support the XRandr extension.
xgamma -gamma .7