According to some comments, Onyx did some tweaking to reduce the minimum after complaints from users, but that might have been hardware tweaking. I guess there should be a better hack, but I can think only of the OReader's built-in feature: if you use this reading app, you can adjust frontlight intensity (1) with a gesture - "scrolling" just at the right edge of the screen or (2) assigning the action to reduce the frontlight to one of 9 touch-zones in settings. There should be at least 3-5 steps below minimum.
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