You might try just lowering the light level to the least amount you really need to read comfortably, see if that doesn't lessen that white line at the top. For myself, I leave the light on always at around 28%. When it's not needed, the page just looks a bit whiter with more contrast, and it's more than enough to read even in a totally dark room for me. I also find it's a minimal battery drain, I still go a few weeks between recharging. And I never have to fool with the light.
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