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Originally Posted by CommanderROR
I put this up at the iRex forums...maybe we'll finally get a straight answer on this matter...so far all answers have been a bit "unclear", so the fear and the hope both lived on...
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Their official answer:
The iLiad hardware was not designed to be capable of doing a suspend-to-flash or suspend-to-ram. This implies that the CPU and the DRAMs have to be powered all the time if the user does not want to boot the iLiad every time.
Current situation:
At this moment (software v2.7.1) the processor and the DRAMs are always running at their full speeds. Also some of the circuits -like the audio sub-circuit- are not yet shut down when they are unneeded. We are working continuously to improve the power management system to achieve the maximum battery life possible.
Progress on this power management system is slow since it must be tested very thoroughly. A failure to test all cases in the power management system could result in very unstable iLiad units and that should be the last thing we want. This awareness has lead us to implement the power management system one subsystem at the time.
Battery life:
iRex tests battery life using an automated setup in which a fully charged iLiad is booted and used to read a book at 1 page per minute speed. The result of this test is reported as battery life to the users.
Conclusion:
So to add things up the iLiad will feature an advanced power management system, but its hardware was not designed to be able to suspend (or hibernate) to flash or ram. To achieve maximum battery life future software versions will throttle down the CPU to 33MHz and put the DRAMs into low power self refresh mode, when the user is reading. The iLiad will then react almost instantly when the page flipper is used.