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ybacklight

Manage screen backlight brightness. See also xbacklight. More information: https://github.com/pixelcmtd/ybacklight.

Print current brightness and maximal brightness, shortened and separated by a slash:

ybacklight Sc/Sm

Set the brightness to 420:

ybacklight s{{420}}

Increase the brightness by 42 big steps (4200 by default):

ybacklight Si{{42}}

Decrease the brightness by 300:

ybacklight d{{300}}