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What: /sys/class/backlight/<backlight>/scale
Date: July 2019
KernelVersion: 5.4
Contact: Daniel Thompson <daniel.thompson@linaro.org>
Description:
Description of the scale of the brightness curve.
The human eye senses brightness approximately logarithmically,
hence linear changes in brightness are perceived as being
non-linear. To achieve a linear perception of brightness changes
controls like sliders need to apply a logarithmic mapping for
backlights with a linear brightness curve.
Possible values of the attribute are:
unknown
The scale of the brightness curve is unknown.
linear
The brightness changes linearly with each step. Brightness
controls should apply a logarithmic mapping for a linear
perception.
non-linear
The brightness changes non-linearly with each step. Brightness
controls should use a linear mapping for a linear perception.
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