It's even more ridiculous: what I described above was what just happened. The light was at two bars, I went into a dark room, it stayed there.
Now I go sit in a chair with an external reading light switched on, directed at my position (and at the reader) and suddenly the light of the ereader turns up. I check and it's at 16 bars -- way more bright than is needed in my current light conditions (I can do without any backlight at all).
Weird.
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