From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: 2.6.25-rc2 System no longer powers off after suspend-to-disk. Screen becomes green. Date: Fri, 22 Feb 2008 12:32:12 -0500 Message-ID: <47BF071C.6040308@rtr.ca> References: <47BEFEC4.7090904@rtr.ca> <200802221802.18640.rjw@sisk.pl> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from rtr.ca ([76.10.145.34]:2212 "EHLO mail.rtr.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752548AbYBVRcO (ORCPT ); Fri, 22 Feb 2008 12:32:14 -0500 In-Reply-To: <200802221802.18640.rjw@sisk.pl> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: "Rafael J. Wysocki" Cc: david@lang.hm, Linus Torvalds , Jesse Barnes , Jeff Chua , lkml , Dave Airlie , linux-acpi@vger.kernel.org, Greg KH Rafael J. Wysocki wrote: > On Friday, 22 of February 2008, Mark Lord wrote: >> david@lang.hm wrote: >> .. >>> I've been watching for kexec hibernate for a little while now, and the >>> last I saw was that acpi was incompatible with the kexec hibernate (but >>> the suspend folks were still claiming that devices needed to be put in >>> the 'right mode' not just powered off. I've been waiting to see this >>> resolved. >> .. >> >> Yeah, exactly. What's so special about poweroff on hibernation? >> Why even bother with the special "S4" state there? > > (1) To be able to wake up with the help of devices that can't wake > the system up from S5 (power off) > (2) To handle some platform devices appropriately over the cycle .. That's the theory. I've read about it, but have yet to imagine any real-life situation where it applies. But this isn't my speciality, so.. do you have experience with any real examples? Thanks! >> I want a real full poweroff, or at least I think I do. Why wouldn't I? >> >> ???? > > You may want that, some people may not want it. > > We are supposed to handle S4, the BIOS/platform may expect us to do that, so > IMO this is a good enough reason to do it. Especially that we can. > > Thanks, > Rafael