Sorry for the very late response. I suppose you already just tried it on your Kindle and know the answers, but maybe it's of interest to others:
Quote:
Originally Posted by JHarry
1.If I choose "Turn off front light", then
will the feature"turns off LED if brightness is below a certain value at power-on" work after restarting?
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The "Turn off front light" button is only available if auto-control is off. This button is a one-time only action, i.e. if you turn your Kindle off and back on, the front light will be back on as well. Now, if you turn the backlight off via "Turn off front light" and then start auto control, the auto control will just handle it whichever way you configured. Personally I always run it with auto-control (actually I forgot there even was this "Turn off front light" button ;-))
Quote:
Originally Posted by JHarry
2.If I choose "Turn off front light", and then in dark situation I change the brightness level, then next day I set the brightness level to zero, does the feature work after I restart the Kindle? Or I need to enter the Front Light Master and set up it again?
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Same as above, i.e. "Turn off front light" is turning it off now, when you change the brightness or turn the Kindle off/on, the backlight will come on. Use auto-control.
Quote:
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3.Could you please add the feature so we can check the brightness level is whether or not zero(turn off LED) ? Or we can do that by ourselves manaually?
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Do you mean you want to see whether the backlight is truly off vs. only very dim? I suggest to go into a dark room and it should be obvious whether it's truly off or not :-)
P.S.: By "turn Kindle off" I mean put it to sleep, of course :-)