Hmm... I have my suspend/screensaver set to display the book cover and that flashes up for a second or two before my KSM poweroff image appears, when I select Power off in KOReader.
There is a way to set a separate Poweroff image, there should be a description in a closed issue at the project on Github. I think it was a couple of lines added to the reader.settings.lua.
Luck;
Ken
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