[Bug 68535] [IVB regression] Screen corruption since Kernel due to DMAR + stolen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68535

Daniel Vetter <daniel at ffwll.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW
            Summary|[IVB regression] Screen     |[IVB regression] Screen
                   |corruption since Kernel 3.9 |corruption since Kernel due
                   |(+ 3.10) with HD 4000 on    |to DMAR + stolen
                   |H77 Board HDMI to DVI       |

--- Comment #20 from Daniel Vetter <daniel at ffwll.ch> ---
Somewhat unsurprisingly dmar/iommmu is the culprit again ...

No idea what exactly goes wrong, but if the IOMMU is supposed to set up an
identiy map for the stolen range for the gfx then that doesn't work out:

[    0.464905] IOMMU: Setting identity map for device 0000:00:02.0 [0xdf800000
- 0xdf9fffff]

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