linux-kernel - Re: Suspend and hibernation status report

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Date:	Tue, 4 Sep 2007 19:32:20 -0400
From:	Len Brown <lenb@...nel.org>
To:	linux-pm@...ts.linux-foundation.org
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pavel Machek <pavel@....cz>
Subject: Re: Suspend and hibernation status report

On Friday 27 July 2007 04:57, Rafael J. Wysocki wrote:

Thanks for writing this, Rafael.

> * system hibernation state - state, in which the system's processors are off and
>   its main memory is not powered, but the information necessary for continuing
>   the computations carried out when the system was last in a working state is
>   preserved in a storage space, such as a disk
> * ACPI S4 state - system hibernation state, in which some information is
>   preserved by the ACPI platform, in accordance with the ACPI specification

"some information is preserved by the ACPI platform" is sort of mis-leading.
What ACPI adds to the hibernate flow is some platform hooks to handle
wakeup devices, and a platform hook for the actual sleep request.
I'm not aware of any information saved by ACPI during S4 that is
not saved were the hibernate to be done with "acpi=off".

thanks,
-Len
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