I don't have the S1. But I have two of the "similars", the T1 and the T3. Both seems to have two modi - one that draws energy (wherein the eReader displays the cover) and one which displays the white screen. The first mode I believe it's like StandBy, the other one is more like PowerOff. I don't know which "blocks" are active in StandBy, but within a week or two any of my Sonies will shutdown, if left in StandBy.
I believe S1 behaves the same.
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