Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762542AbZCYRxm (ORCPT ); Wed, 25 Mar 2009 13:53:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753966AbZCYRxd (ORCPT ); Wed, 25 Mar 2009 13:53:33 -0400 Received: from casper.infradead.org ([85.118.1.10]:44126 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752811AbZCYRxc (ORCPT ); Wed, 25 Mar 2009 13:53:32 -0400 Subject: Re: 2.6.29: can't resume from suspend with DMAR (intel iommu) enabled From: David Woodhouse To: Ingo Molnar Cc: Andrew Lutomirski , Jesse Barnes , Kyle McMartin , Fenghua Yu , Suresh Siddha , Yinghai Lu , Mark Gross , LKML In-Reply-To: <20090324203259.GC26930@elte.hu> References: <20090324203259.GC26930@elte.hu> Content-Type: text/plain Date: Wed, 25 Mar 2009 17:53:01 +0000 Message-Id: <1238003581.2085.53.camel@macbook.infradead.org> Mime-Version: 1.0 X-Mailer: Evolution 2.24.5 (2.24.5-1.fc10) Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1486 Lines: 38 On Tue, 2009-03-24 at 21:32 +0100, Ingo Molnar wrote: > (Cc:s added) > > * Andrew Lutomirski wrote: > > > On vanilla 2.6.29 (on Ubuntu 8.10), on a Lenovo x200s, my system > > is completely hosed on resume. It appears that even hard disk IO > > didn't work (trying to do *anything* including getting a dmesg > > trace just spewed sda io errors to the console). Hence no trace. > > I did an alt-sysrq-b and the screen went blank and the machine > > just started beeping at me. > > > > Resume works much better with intel_iommu=off. (I remember seeing > > a patch go by that purported to fix resume with IOMMU enabled, but > > it didn't work for me.) > > > > I'd be happy to try to make a better bug report if anyone has any > > bright ideas. > > i have a Lenovo T500 that does not even boot with with DMAR enabled > in the BIOS (it's default-off), i get this panic in early bootup: > > DMAR hardware is malfunctioning Can you show me the output of the pr_debug() statement at dmar.c:543 (in alloc_iommu()? And bring me the head of a BIOS author. -- David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation -- 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/