[RESEND PATCH v3 3/4] backlight: pwm_bl: compute brightness of LED linearly to human eye.

When you want to change the brightness using a PWM signal, one thing you need to consider is how human perceive the brightness. Human perceive the brightness change non-linearly, we have better sensitivity at low luminance than high luminance, so to achieve perceived linear dimming, the brightness

[RESEND PATCH v3 3/4] backlight: pwm_bl: compute brightness of LED linearly to human eye.

When you want to change the brightness using a PWM signal, one thing you need to consider is how human perceive the brightness. Human perceive the brightness change non-linearly, we have better sensitivity at low luminance than high luminance, so to achieve perceived linear dimming, the brightness