Screen brightness and auto dim

Hello everyone,
I'm just wondering why the screenbrightness gets reduced in dark surroundings with turned on auto dim even more than it is manually possible.
I would like to turn auto dim off and only control the brightness with the manual control but this does not let me reduce screenbrightness enough.
Does anyone have a good suggestion? 

Thanks for your reply. But that's not exactly what I was looking for.
There is a big difference in how dark the display can be set when using the automatic backlight dimming. When turned on the screen can get to a very low brightness at night. It is not possible to achieve the same low brightness with automatic backlight dimming turned off.
I suppose that this might only be possible with a software change.

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