Your finding about the hard disk power management setting raises a
couple of questions. 1. Would the power setting change cause issues if
the user hibernated on battery and restored with line power or vice
versa. 2. Apart from the power setting change, what about the use case
where the user hibernates, changes batteries (one could imagine this on
a long plane flight), and then resumes. Is that a situation covered by
the hibernation code? (I ask because the one time in Karmic that I did
change batteries --- I changed from one size battery to another --- on
resume I got an ACPI error message and terrible things happened.)

Regarding your comment (b), I can unfortunately confirm that terrible
things happen if you choose a different system than the one you
hibernated.

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IBM/Lenovo Laptops crash when waking up from hibernation
https://bugs.launchpad.net/bugs/350680
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