[Bug 60391] [ilk regression] 3.7.x corrupt console image, hard hang starting X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=60391

--- Comment #23 from Nathan Myers <ncm at cantrip.org> ---
Yes, to be precise, I tested 

1. a STOCK 3.7.7 kernel with IOMMU configured OFF and booted with NO option 
intel_iommu=igfx_off (success)

2. a STOCK 3.7.7 kernel with IOMMU configured ON and booted with NO option 
intel_iommu=igfx_off (FAIL)

3. a PATCHed 3.7.7 kernel with IOMMU configured OFF and booted with NO option 
intel_iommu=igfx_off (success)

4. a PATCHed 3.7.7 kernel with IOMMU configured ON and booted with NO option 
intel_iommu=igfx_off (success)

5. a PATCHed 3.7.7 kernel with IOMMU configured ON and booted WITH option 
intel_iommu=igfx_off (success)

where PATCH refers to attachment 74737, "Disable WC PTE updates for ILK VTd",
and IOMMU ON as defined in #21.

btw: It seems as if I cannot turn off CONFIG_IOMMU_HELPER or 
CONFIG_CONFIG_SWIOTLB using the regular configuration tools.

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