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I was one of those who was having significant battery drainage during suspend on my H2O, however a combination of the following changes seems to have fixed the issue for me:
1. Replaced the Koreader suspend.sh with the suspend.sh from Coolreader (vlasovsoft)
2. Within the new suspend.sh I commented out the line . $ROOT/wifi_off.sh (Koreader does not have wifi_off.sh in Root and hunting for it seemed to make the suspend.sh unreliable). I do not use wifi so simply commenting out the line works for me.
3. Within frontend/device/kobo/device.lua I commented out the line [59] = "Power_SleepCover" (this is because I have a sleepcover, which also seemed to add unreliability in the suspend process in Koreader, which has no direct option to disable Sleepcover).
4. Finally, but this may be completely unnecessary, I extended to "12" from "10" the time in the line for UIManager:scheduleIn in frontend/device/generic/device.lua
All of my changes came from me sifting through the invaluable posts of much cleverer others both here and on Github. I don't know if they are all necessary, but they do seem to have worked for me.
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