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brightnessctl: add page (#6516)

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DaxGoon 2021-09-16 20:49:58 +03:00 • committed by GitHub
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# brightnessctl
> Utility for reading and controlling device brightness for GNU/Linux operating systems.
> More information: <https://github.com/Hummer12007/brightnessctl>.
- List devices with changeable brightness:
`brightnessctl --list`
- Print the current brightness of the display backlight:
`brightnessctl get`
- Set the brightness of the display backlight to a specified percentage within range:
`brightnessctl set {{50%}}`
- Increase brightness by a specified increment:
`brightnessctl set {{+10%}}`
- Decrease brightness by a specified decrement:
`brightnessctl set {{-10%}}`