brightnessctl − read and control device brightness
brightnessctl [options] [operation] [value...]
Print this help.
List devices with available brightness controls.
Do not perform write operations.
Produce machine−readable output.
Set minimum brightness when using delta values, defaults to 1.
Changes percentage scaling curve to exponential (linear by default). Default exponent is 4.
Percentage equation: % = [VALUE]^[K] * [MAX] * 100^-[K].
The exponential curve may make the adjustments perceptually equal.
Save state in a temporary file.
Restore previously−saved state.
Specify device name (can be a wildcard).
Specify device class.
Print version and exit.
Get device info.
Get the current brightness of the device.
Get the maximum brightness of the device.
s, set VALUE
Set the brightness of the device.
You may specify VALUE for the set command in absolute or relative form, and as a value or a delta from the current value. For example:
brightnessctl set 500
Sets brightness to 500.
brightnessctl set 50%
Sets brightness to 50% of the maximum.
brightnessctl set 50-
Subtracts 50 from the current brightness.
brightnessctl set +10
Adds 10 to the current brightness.
brightnessctl set 50%-
Subtracts 50% of the maximum from the current brightness.
brightnessctl set +10%
Adds 10% of the maximum to the current brightness.
Maintained by Mykyta Holubakha, who is assisted by other open source contributors. For more information about brightnessctl development, visit: