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    SubjectRe: 2.6.29: can't resume from suspend with DMAR (intel iommu) enabled
    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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