1What: /sys/class/backlight/<backlight>/scale 2Date: July 2019 3KernelVersion: 5.4 4Contact: Daniel Thompson <daniel.thompson@linaro.org> 5Description: 6 Description of the scale of the brightness curve. 7 8 The human eye senses brightness approximately logarithmically, 9 hence linear changes in brightness are perceived as being 10 non-linear. To achieve a linear perception of brightness changes 11 controls like sliders need to apply a logarithmic mapping for 12 backlights with a linear brightness curve. 13 14 Possible values of the attribute are: 15 16 unknown 17 The scale of the brightness curve is unknown. 18 19 linear 20 The brightness changes linearly with each step. Brightness 21 controls should apply a logarithmic mapping for a linear 22 perception. 23 24 non-linear 25 The brightness changes non-linearly with each step. Brightness 26 controls should use a linear mapping for a linear perception. 27