Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763380AbZCYR2g (ORCPT ); Wed, 25 Mar 2009 13:28:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756877AbZCYR21 (ORCPT ); Wed, 25 Mar 2009 13:28:27 -0400 Received: from mga05.intel.com ([192.55.52.89]:4137 "EHLO fmsmga101.fm.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753558AbZCYR20 (ORCPT ); Wed, 25 Mar 2009 13:28:26 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.38,420,1233561600"; d="scan'208";a="441979676" Date: Wed, 25 Mar 2009 10:32:12 -0700 From: mark gross To: Ingo Molnar Cc: Andrew Lutomirski , David Woodhouse , Jesse Barnes , Kyle McMartin , Fenghua Yu , Suresh Siddha , Yinghai Lu , David Woodhouse , LKML Subject: Re: 2.6.29: can't resume from suspend with DMAR (intel iommu) enabled Message-ID: <20090325173212.GA30701@linux.intel.com> Reply-To: mgross@linux.intel.com References: <20090324203259.GC26930@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090324203259.GC26930@elte.hu> User-Agent: Mutt/1.5.17+20080114 (2008-01-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1431 Lines: 38 On Tue, Mar 24, 2009 at 09:32:59PM +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 That happens when the polling of the IOMMU registers fail to behave as expected in the VT-d specification. Typically its been a bios issue when this happens. > > So i dont get to test suspend/resume ;-) > > Ingo -- 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/