linux-kernel - Re: 2.6.29: can't resume from suspend with DMAR (intel iommu) enabled

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Message-Id: <1239398868.712.1148.camel@macbook.infradead.org>
Date:	Fri, 10 Apr 2009 14:27:48 -0700
From:	David Woodhouse <dwmw2@...radead.org>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Andrew Lutomirski <amluto@...il.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Kyle McMartin <kyle@...hat.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Mark Gross <mgross@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.29: can't resume from suspend with DMAR (intel iommu)
 enabled

On Tue, 2009-04-07 at 08:56 +0100, Matthew Garrett wrote:
> On Mon, Apr 06, 2009 at 01:56:01PM -0700, David Woodhouse wrote:
> 
> > Dirk reported the same panic, but we've just turned his iommu back on
> > and completely failed to reproduce the problem -- so I'm kind of stuck.
> 
> I saw this on a T400, but only on the first boot after enabling DMAR - 
> power cycling "fixed" it.

Ah, I can reproduce now -- thanks for spotting that. I'll come up with
something that can spot this failure mode early and bail out. With a
nasty message about BIOS engineers.

-- 
dwmw2

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