Re: Re: [PATCH] swsusp: do not use pm_ops (was: Re: suspend2 merge (was: Re: CFS and suspend2: hang in atomic copy))

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On Fri, 2007-05-04 at 10:51 -0400, Alan Stern wrote:

> Exactly because we are waffling on this issue.  If we settled the matter 
> once and for all (devices must ALWAYS be reinitialized after the snapshot 
> is restored) then we wouldn't have those problems.  (We might have other 
> problems though...)

From what I've understood so far, ACPI is very unhappy on some machines
if you go to S5 after hiberation. I still don't understand why, if the
ACPI code would properly re-initialise itself (treat ACPI as a device
and apply your "devices must ALWAYS be reinitialized after the snapshot
is restored") then this shouldn't be possible to happen.

And at that point I agree that the issue becomes completely orthogonal.

(btw, it's always possible right now to go to S5 instead of S4 when
doing hibernation simply by changing /sys/power/disk to "shutdown")

johannes

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