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SubjectRe: Hibernation considerations
On Tue, 17 Jul 2007, Jeremy Maitin-Shepard wrote:

> david@lang.hm writes:
>
> [snip]
>
>> the non-ACPI hibernate behaves very differently, and for some people (and I
>> think I am one of them) it will meet their needs better then _any_ of the ACPI
>> suspends.
>
> It may have certain differences from the user point of view, but from
> the implementation view, it seems that it is nearly exactly the same.
> The only differences seem to be:
>
> - rather than shutting down, do whatever is necessary to stick the
> system in S4 state.
>
> - make sure ACPI isn't initialized by the "load image" kernel
>
> - rather than "resume from hibernate" ACPI by initializing it normally,
> issue the special hibernate-related methods.
>
> Thus, it seems that supporting ACPI S4 will have a very minimal affect
> on the hibernate implementation.

from what Rafael is saying supporting ACPI S4 mode requires a very
fundamentally different restore approach, and in addition imposes very
different restrictions on what can be done with the machine while it's
suspended.

David Lang
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