Screen brightness and PWM

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Hi,

Any hardware devs able to answer this?

Basically, does the display on the PinePhone use PWM to control brightness?
I hope not! But if so, what's the duty cycle?

Looking at the DTS, it seems it uses Linux kernel's PWM driver(?) to adjust brightness, does that imply PMW at the hardware level or not neccessarly?

Thanks.

PS: Whilst at it, how about the PineTab?