That possibly leaves the fact that, if we go by our PocketBook experience, sunxi SoCs really like to murder batteries if you don't suspend aggressively (as in, *while* reading). I kind of hate the feature, because it ruins interactivity, though, which is why I never really bothered to implement it in KOReader
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I'll probably do some more experiments when I have some free time in a few months, because doing it right and getting it to behave is... quirky.