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The screen saver displayed on the screen has very little to do with when the CPU goes to sleep.
Yup, it is a fast resume, it is intended to be a Linux wake-up function fast enough to find your laptop awake by the time you open the top.
I.E: It does a "suspend to ram" function.
(and the ram is running on a minimal 'stay alive' power function)
Yup, the Kindle also has a micro-controller or two that DOES continue to run, including one that maintains the rtc (real time clock).
(think about it, how else can you do an electronic resume function on a mechanical push button (or hall effect device) without something that continues to run?).
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