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    SubjectRe: [PATCH] drm/i915: By default, enable RC6 on IVB and SNB when reasonable
    On Wed, Nov 23, 2011 at 03:03:43PM +0000, David Woodhouse wrote:
    > On Wed, 2011-11-23 at 15:39 +0100, Daniel Vetter wrote:
    > > At least for the dmar+gfx+semaphores hang I can reproduce, just disabling
    > > dmar with intel_iommu=igfx_off is not good enough and iirc the same holds
    > > for the dmar+rc6 hangs reported.
    >
    > Um... let me restate that for clarity (and partly for Rajesh's benefit).
    >
    > The DMAR associated with the integrated graphics is *disabled*.
    > Turned off. Not active. Ever.

    Hm, that comment confuses me a bit. I've always thought that igfx_off only
    instantiates a identity mapping and leaves the dmar unit on. Is that
    wrong?
    -Daniel
    --
    Daniel Vetter
    Mail: daniel@ffwll.ch
    Mobile: +41 (0)79 365 57 48


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