Re: Hibernation considerations

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On Sat, 21 Jul 2007, Pavel Machek wrote:

Hi!

Pavel Machek <[email protected]> writes:

[snip]

So it will be break at least battery status and "AC plugged in"
status, because those are handled by ACPI and we do not know how to
control them by hand.

It seems that it should be possible to initialize ACPI as if the system
just booted up normally.  Then battery status and such should be
correct, since they are correct after normal initialization.

It should be possible to make hibernate look just like a reboot to all
of the devices, including ACPI stuff.

Patch to make that work with swsusp/shutdown method would be indeed
welcome. It does not work today.

is this a problem in the restore path?

with the kexec approach (and ignoring suspend to ram and disk for the moment) the system will actually get shutdown completely after the image is written. on resume it gets cold booted. at this point the ACPI stuff should have no problem

now if the ACPI drivers are storing something in ram about the battery status and AC power status, but don't re-check after the resume, it seems to me that they can't possibly be reliable anyway. if they do re-check after the resume then where's the problem?

David Lang
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