09:50 <Viciouss> I'm trying to use the pwm-backlight with a galaxy note 10.1 (exynos 4412) and it works almost fine, except when I echo the maximum brightness into the sysfs node, this makes the display go dark. what could be the reason for this? I also tried setting the pwm gpio to 0x3 which is LCD_PWM in the manual but then the display doesn't work at all

09:52 <Viciouss> using kernel 5.8.x

11:35 <krzk> Viciouss: so 0 and 255 are dark?

11:36 <krzk> Viciouss: you could try with different drive strengths for this GPIO, or check whether regulator has proper values

18:36 <Viciouss> krzk: exactly, 0 and 255 are dark. I tried different drive strengths now but the result is the same. about the regulator, I'm not sure how the backlight is actually supplied. the display is mostly managed via mdnie in the old kernel and there are quite some magic numbers involved which I don't understand

19:43 <Viciouss> I also tried other periods but as soon as the duty % is at 100, the backlight turns off