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Double-click the power button to turn the back-light on dimly (e.g., 2%) if it is off.
I normally read with a lamp on, and so don't use the back-lighting on my Libra. However if I wake up in the middle of the night and want to read, I don't want to turn the lamp on and disturb my partner.
It is almost impossible to try to turn the back-lighting on in the dark via the touch screen. If you could double-click or otherwise manipulation the physical power button to jog the back-light up to 1 or 2%, that is enough for you to see the touch screen well enough to take it from there.
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