From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756175AbXIDX32 (ORCPT ); Tue, 4 Sep 2007 19:29:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754160AbXIDX3V (ORCPT ); Tue, 4 Sep 2007 19:29:21 -0400 Received: from hera.kernel.org ([140.211.167.34]:46554 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754041AbXIDX3U (ORCPT ); Tue, 4 Sep 2007 19:29:20 -0400 From: Len Brown Organization: Intel Open Source Technology Center To: linux-pm@lists.linux-foundation.org Subject: Re: Suspend and hibernation status report Date: Tue, 4 Sep 2007 19:32:20 -0400 User-Agent: KMail/1.9.5 Cc: "Rafael J. Wysocki" , LKML , Nigel Cunningham , Pavel Machek References: <200707271057.05438.rjw@sisk.pl> In-Reply-To: <200707271057.05438.rjw@sisk.pl> MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="iso-8859-2" Content-Transfer-Encoding: 7bit Message-Id: <200709041932.21281.lenb@kernel.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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