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No brightness #6

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buddhi-deep opened this issue Mar 13, 2021 · 2 comments
Open

No brightness #6

buddhi-deep opened this issue Mar 13, 2021 · 2 comments

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@buddhi-deep
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/sys and the following directories no bright ness
@MarSoft
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MarSoft commented Aug 20, 2023

If you do not have anything in /sys/class/backlight/ then you should first enable the corresponding device tree overlays for your display.
Also you should know that some displays don't support brightness control at all. Personally I had to make a hardware mod to my 3.5" display shield to enable brightness control (unsolder one resistor and add in a transistor + another resistor).

@kirk-loeten
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on my Raspi is the folder /sys/class/backlight/10-0045/actual_brightness. I change the three folder in the timeout.c and do a new make and it's work

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@MarSoft @kirk-loeten @buddhi-deep