Return-path: Received: from ogre.sisk.pl ([217.79.144.158]) by bombadil.infradead.org with esmtp (Exim 4.68 #1 (Red Hat Linux)) id 1JcTWR-0005PC-9c for kexec@lists.infradead.org; Thu, 20 Mar 2008 22:46:08 +0000 From: "Rafael J. Wysocki" Subject: Re: [linux-pm] [PATCH -mm] kexec jump -v9 Date: Thu, 20 Mar 2008 23:45:23 +0100 References: <20080320104019.GA6870@elf.ucw.cz> In-Reply-To: <20080320104019.GA6870@elf.ucw.cz> MIME-Version: 1.0 Content-Disposition: inline Message-Id: <200803202345.25083.rjw@sisk.pl> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Pavel Machek Cc: nigel@nigel.suspend2.net, Kexec Mailing List , linux-kernel@vger.kernel.org, Alan Stern , "Eric W. Biederman" , Andrew Morton , linux-pm@lists.linux-foundation.org, Vivek Goyal On Thursday, 20 of March 2008, Pavel Machek wrote: > On Tue 2008-03-18 21:25:27, Eric W. Biederman wrote: > > Alan Stern writes: > > > > > On Wed, 19 Mar 2008, Rafael J. Wysocki wrote: > > > > > >> Well, I've been saying that for I-don't-remember-how-long: on my box, if you > > >> use S5 instead of entering S4, the fan doesn't work correctly after the > > >> resume. Plain and simple. > > >> > > >> Perhaps there's a problem with our ACPI drivers that causes this to happen, > > >> but I have no idea what that can be at the moment. > > > > > > IMO it would be worthwhile to track this down. It's a clear indication > > > that something is wrong somewhere. > > > > > > Could it be connected with the way the boot kernel hands control over > > > to the image kernel? Presumably ACPI isn't prepared to deal with that > > > sort of thing during a boot from S5. It would have to be fooled into > > > thinking the two kernels were one and the same. > > > > It should be easy to test if it is a hand over problem, by turning off > > the laptop by placing it in S5 (shutdown -h now) and then booting same > > kernel again. > > Feel free to help with testing. > > I believe ACPI is simply getting confused by us overwriting memory > with that from old image. I don't see how you can emulate it with > shutdown. Well, in fact ACPI has something called the NVS memory, which we're supposed to restore during the resume and which we're not doing. The problem may be related to this. I have fixing that on my todo list, but frankly there's many different things in there. :-) Thanks, Rafael _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec