| 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. |