Well, I've tried to compare my screen dimming to the auto light dimmer function and it doesn't seem to make a difference. You can turn off the Automatic headlamp function with the light switch, which I do, but it doesn't affect the dimming of the screen display. Cloudy or sunny days don't seem to affect it either. It just goes dim, then randomly it will go bright again. And then randomly it will go back to dim. Or sometimes it will stay bright and not have any issues. But guaranteed that if I need to see something on that display, such as a radio function, or phone function, it will be dim and I will have to wait for it to go bright again on it's own.
I guess it's just that the electronic controls on these new trucks just think that they are smarter than we are.
And don't get me started on Chrysler/RAM products....I have one of those too. Ha!