| 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. |
