Hi, new to DUDU-world and having the same issue.
Obviously the OS is not regulating the controller that actually dims the screen illumination. Hopefully this is just a bug and not a lack of this essential device onboard. My guess is, there is a PWM-controller sitting somewhere, perhaps even unused?
@caolz can you say anything to this please? This issue should really be addressed as the either terribly bright or alternatively very milky screen is really spoiling the user-experience.
The user-experience is actually the reason why I bought a DUDU. 😉