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From: Len Brown <lenb@kernel.org>
To: linux-pm@lists.linux-foundation.org
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
	LKML <linux-kernel@vger.kernel.org>,
	Nigel Cunningham <nigel@nigel.suspend2.net>,
	Pavel Machek <pavel@ucw.cz>
Subject: Re: Suspend and hibernation status report
Date: Tue, 4 Sep 2007 19:32:20 -0400	[thread overview]
Message-ID: <200709041932.21281.lenb@kernel.org> (raw)
In-Reply-To: <200707271057.05438.rjw@sisk.pl>

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

  reply	other threads:[~2007-09-04 23:29 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-07-27  8:57 Suspend and hibernation status report Rafael J. Wysocki
2007-09-04 23:32 ` Len Brown [this message]
2007-09-08 21:40   ` Rafael J. Wysocki
2007-09-09  9:10     ` Maciek Rutecki

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