tkaiser replied at Tue Nov 25, 2014 08:44
Thank you. Just had a look in the fex file for the 7" display:
There it's GPIO pin 57 instead:Wha ...
What do you mean with unstable/flickering? Isn't it enough to switch the pin off?
It's ok for on/off control (not using PWM).
PWM should allow to adjust the backlight with various brightness levels (from 0=off to 255=full on, I believe), but this pin doesn't support hardware PWM. Software PWM works but is CPU dependant, so backlight flickers.
The 2 scripts I linked work well for simple on/off control.
Does that mean that I should switch pin 55 also to 0 when I want to disable the backlight?
I don't think it's necessary.