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

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Date:	Tue, 24 Mar 2009 13:36:46 -0700
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	'Ingo Molnar' <mingo@...e.hu>,
	'Andrew Lutomirski' <amluto@...il.com>,
	'David Woodhouse' <dwmw2@...radead.org>,
	'Jesse Barnes' <jbarnes@...tuousgeek.org>,
	'Kyle McMartin' <kyle@...hat.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	'Yinghai Lu' <yinghai@...nel.org>,
	"Woodhouse, David" <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 ;-)
>
Current kernel doesn't have iommu suspend/resume support yet. I'll send out suspend/resume patches today or tomorrow. Hope that will help.

Thanks.

-Fenghua
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