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xbacklight — Utility to adjust backlight brightness using the RandR extension. More information: <https://manned.

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandbrightnessbacklightcliusingadjustxbacklightutility

linux

Problem

How to use the xbacklight command: Utility to adjust backlight brightness using the RandR extension. More information: <https://manned.org/xbacklight>.

Solution

xbacklight — Utility to adjust backlight brightness using the RandR extension. More information: <https://manned.org/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}}

Code Snippets

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}}

Context

tldr-pages: linux/xbacklight

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