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If this is true, it's a design mistake. Backlight should never be paired, it should be activated on demand either by a button or by an ambiance light sensor. Having backlight turned on when reading a book on an e-ink screen during a day is a ridiculous waste of battery unless you hide in a closet.

There's a brightness adjust, which goes from "off" to "really quite bright thanks". Ambient light sensor was added with the Voyage? which is relatively recent.

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