I have an F30 w/the HUD, I assume it's the exact same (except for M mode, obviously) It doesn't auto-dim, but it does switch colors when the headlights come on. That is, during the day, when your lights are off, it displays white. During night, when your headlights are on, it displays orange. I always leave my headlights on Auto ON/OFF but I assume it would work the same if you manually switch them. There is also a way you can adjust the brightness in the setting, but it stays constant day or night. The only thing that changes is the text color. Hope that helps.
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