TLDR
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xbacklight

 
Utility to adjust backlight brightness using the RandR extension. More information: https://gitlab.freedesktop.org/xorg/app/xbacklight.
 
  • Get the current screen brightness as a percentage:
     
    xbacklight
     
  • Set the screen brightness to 40%:
     
    xbacklight -set {{40}}
     
  • Increase current brightness by 25%:
     
    xbacklight -inc {{25}}
     
  • Decrease current brightness by 75%:
     
    xbacklight -dec {{75}}
     
  • Increase backlight to 100%, over 60 seconds (value given in ms), using 60 steps:
     
    xbacklight -set {{100}} -time {{60000}} -steps {{60}}

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