[Bug 91127] Graphics problems with intel_iommu=on on Linux >= 3.7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91127

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Ting-Wei Lan from comment #5)
> My gpu_devid is 0x0042, but
> PCI_DEVICE_ID_INTEL_IRONLAKE_M_HB is 0x0044 and
> PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG is 0x0046.

diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index 3bb678e..7c68576 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -581,7 +581,7 @@ static inline int needs_ilk_vtd_wa(void)
        /* Query intel_iommu to see if we need the workaround. Presumably that
         * was loaded first.
         */
-       if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_HB ||
+       if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG ||
             gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) &&
             intel_iommu_gfx_mapped)
                return 1;

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