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Originally Posted by yankeejeep
I am just assuming that the CPU remains functioning at a low level or items such as alarms and other timed 'wake ups' would not be able to actually run to wake the device up. AFAIK you do need to be running at a minimal level in order for apps to trip the system. I don't know if it even needs to hit double digits, but there are going to be a few cycles per second or apps can't do their little wake-up calls.
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Interesting question/remark - I'll look around regarding this question. Dunno if the CPU is needed for this - for example, my Cambrdige (Sinclair) Z88 (an old portable computer; really revolutionary at its time and usable even now for PIM functions & text editing & even simple text browsing on the web) also supports alarm wake-up from hybernation, but has - if you don't use RAM memory extension cartridges; that is, the system only needed to power 32k RAM - about a year (!) or suspension time with normal 4*AA batteries, even with enabled alarms. I don't think 20-year-old technology like the Z88 used the Z80 (which was for sure far less scaalable than current Xscale CPU's) for alarm wakeup functions - really an interesting question worth a detailed investigation.