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    SubjectRe: IOMMU and graphics cards
    On Mon, Jul 06, 2009 at 01:26:17PM +0100, David Woodhouse wrote:
    > On Fri, 2009-05-08 at 11:35 +0200, Joerg Roedel wrote:
    > > The other way to achieve consistency is to remove the workaround from
    > > VT-d code which significantly increases the chance to get the broken
    > > stuff fixed. David?
    >
    > It's gone from 2.6.31-rc2, but even the in-tree drivers break, so I
    > think we have to put it back for 2.6.31 (I've sent Linus the pull
    > request already).
    >
    > I do intend to remove it again for 2.6.32 though, and I filed
    > http://bugzilla.kernel.org/show_bug.cgi?id=13721
    >
    > For now it's got a clearer description ("Workaround broken graphics
    > drivers") and defaults to 'n'.

    Ok, cool, that sounds good. Which in-kernel DRM drivers break with IOMMU
    for you? I'll may probably add a similar temporary workaround for AMD
    IOMMU too...

    Joerg

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