| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 1 | What: /sys/class/backlight/<backlight>/scale |
| 2 | Date: July 2019 |
| 3 | KernelVersion: 5.4 |
| 4 | Contact: Daniel Thompson <daniel.thompson@linaro.org> |
| 5 | Description: |
| 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. |