It wont sleep when it's plugged in and set CPU doesn't show sleep state times that's why on your pic it doesn't have it's own color in the leger get CPU spy.. mine only show 300-1200 but CPU spy shows that It has hit deep sleep..try it out
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When not in use it should drop down to 300 (that has been my experience in every other ROM). It isn't doing that for some reason. I don't have the Kindle on me, I'll have to check what difference the WiFi settings changes had latter.