Messages in this thread |  | | | Date | Tue, 24 Mar 2009 16:40:28 -0400 | | From | Kyle McMartin <> | | Subject | Re: 2.6.29: can't resume from suspend with DMAR (intel iommu) enabled |
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On Tue, Mar 24, 2009 at 01:36:46PM -0700, Yu, Fenghua wrote: > > > >(Cc:s added) > > > >* Andrew Lutomirski <amluto@gmail.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. >
Heh, awesome, someone could have brought this, uhm, subtle, weakness when things were getting defaulted on...
regards, Kyle
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