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

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Message-Id: <200903242103.01109.rjw@sisk.pl>
Date:	Tue, 24 Mar 2009 21:03:00 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Lutomirski <amluto@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, x86@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, iommu@...ts.linux-foundation.org,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: Re: 2.6.29: can't resume from suspend with DMAR (intel iommu) enabled

Added some CCs.

On Tuesday 24 March 2009, 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.
> 
> --Andy
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