Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966192AbXHIPJT (ORCPT ); Thu, 9 Aug 2007 11:09:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S966202AbXHIPIx (ORCPT ); Thu, 9 Aug 2007 11:08:53 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:3175 "EHLO spitz.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S966187AbXHIPIu (ORCPT ); Thu, 9 Aug 2007 11:08:50 -0400 Date: Thu, 9 Aug 2007 15:06:35 +0000 From: Pavel Machek To: Tejun Heo Cc: Robert Hancock , Michael Sedkowski , "Rafael J. Wysocki" , Henrique de Moraes Holschuh , linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, linux-acpi@vger.kernel.org, Thomas Renninger Subject: Re: Disk spin down issue on shut down/suspend to disk Message-ID: <20070809150634.GA3926@ucw.cz> References: <46B7AF53.1040307@shaw.ca> <46B8140E.3000509@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <46B8140E.3000509@gmail.com> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1647 Lines: 34 Hi! > >> Oh... crap, so acpi wants to sync cache on shutdown. I wonder whether > >> it spins down the disk correctly. Does emergency unload count increase > >> after each power down? Also, please post the result of 'dmidecode'. > > > > I know that my Compaq X1000-series laptop does do some kind of ACPI > > games with the disk on ACPI power off (I assume it is putting the disk > > in standby before power-off at least). It also does this if you boot > > into DOS, GRUB, etc. and then hit the power button. Could be if the disk > > is dumb enough to spin up for sync cache and standby when there is > > nothing to flush, and the kernel does its own standby, this could cause > > an extra spinup/down.. > > Yeah, that seems to be what's going on. I don't think we have any other > choice than blacklisting those notebooks. This is a mess. How does the > other OS cope with this? > > I'm thinking about using DMI vendor/product match to detect the affected > systems but I think it would be better to match the ACPI implementation > directly. Is there a way to match specific ACPI implementation? Well.. unless they use some SMM trick, it is ACPI AML code telling kernel to spin the disk down. I guess we could detect that, and simply ignore the request. -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/