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

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Message-ID: <20090324203259.GC26930@elte.hu>
Date:	Tue, 24 Mar 2009 21:32:59 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Lutomirski <amluto@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	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>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Mark Gross <mgross@...ux.intel.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.29: can't resume from suspend with DMAR (intel iommu)
	enabled


(Cc:s added)

* Andrew Lutomirski <amluto@...il.com> 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

So i dont get to test suspend/resume ;-)

	Ingo
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