xbacklight

Utility to adjust backlight brightness using the RandR extension.

More information.

• 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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