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Port Number: B020-B026

Memory-mapped address: F60020-F60026

Function: Backlight Control

This range of ports controls the backlight. Other ports in this range affect the backlight, generally causing the backlight to go to full brightness.

Port    Information   
B020 Unknown
B021 Unknown
B022 Unknown
B023 Unknown
B024 Backlight PWM level; controls the backlight PWM dimming level. 00 is full PWM duty cycle, FF is minimum duty cycle. When booting, this is set to FF, and later changed with the value in brightness.
B025 Unknown
B026 Unknown