eXistenZ, I'm not having that problem with my Kobo Glo, firmware 2.10, and a Kobo Sleepcover. Setting the brightness to 2% works fine, the setting is maintained at 2% between openings and closings of the cover, and the light comes on properly when the cover is opened and shuts off when it is closed.
It's only when powering off with a long press of the power switch -- which is not the same as stand-by/sleep, initiated by a short press -- that I see the setting being redued to 1% on powering back on and when powered on, the light is off until I press the physical light button again.
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