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@odamizu No problem. In the setup you described (lowest device brightness) + app brightness, no extra power is used. Power is only wasted when app brightness is applied while the device brightness is not zero. This case (which occurs often) means that the reader could have achieved the same brightness using the device slider (and saving battery) not needing app brightness (losing any battery savings).
Marvin controls brightness 'physically' but also has an 'application' extra dimming option since the v1 days. There is a tutorial on this Settings > About > Tutorial
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