From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rafael J. Wysocki" Subject: Re: 2.6.18-rc4 (and earlier): CMOS clock corruption during suspend to disk on i386 Date: Wed, 9 Aug 2006 22:51:57 +0200 Message-ID: <200608092251.58062.rjw@sisk.pl> References: <200608091426.31762.rjw@sisk.pl> <200608092201.42885.rjw@sisk.pl> <20060809131232.75a260e1.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from ogre.sisk.pl ([217.79.144.158]:28132 "EHLO ogre.sisk.pl") by vger.kernel.org with ESMTP id S1751368AbWHIUw5 (ORCPT ); Wed, 9 Aug 2006 16:52:57 -0400 In-Reply-To: <20060809131232.75a260e1.akpm@osdl.org> Content-Disposition: inline Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Andrew Morton Cc: Pavel Machek , LKML , Linux ACPI On Wednesday 09 August 2006 22:12, Andrew Morton wrote: > On Wed, 9 Aug 2006 22:01:42 +0200 > "Rafael J. Wysocki" wrote: > > > On Wednesday 09 August 2006 14:30, Pavel Machek wrote: > > > Hi! > > > > > > > > It looks like the CMOS clock gets corrupted during the suspend to disk > > > > on i386. I've observed this on 2 different boxes. Moreover, one of them is > > > > AMD64-based and the x86_64 kernel doesn't have this problem on it. > > > > > > > > Also, I've done some tests that indicate the corruption doesn't occur before > > > > saving the suspend image. It rather happens when the box is powered off > > > > or rebooted (tested both cases). > > > > > > > > Unfortunately, I have no more time to debug it further right now. > > > > > > Do you have Linus' "please corrupt my cmos for debuggin" hack enabled? > > > > Well, I know nothing about that. ;-) > > > > CONFIG_PM_TRACE=y will scrog your CMOS clock each time you suspend. Oh dear. Of course it's set in my .config. Thanks a lot for this hint. :-) BTW, it's a dangerous setting, because some drivers get mad if the time after the resume appears to be earlier than the time before the suspend. Also the timer .suspend/.resume routines aren't prepared for that.