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.