[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 #21 from Nathan Myers <ncm at cantrip.org> ---
I built stock 3.7.7 with IOMMU turned on, and patched, and 
booted with and without the suggested option.  It booted to
full X both times.  Without the patch, and built with IOMMU on,
it fails reliably.  Without the patch, and without IOMMU, it
boots and runs X with no apparent problems.

IOMMU turned on means:

# CONFIG_CALGARY_IOMMU is not set
CONFIG_IOMMU_HELPER=y
CONFIG_IOMMU_API=y
CONFIG_IOMMU_SUPPORT=y
# CONFIG_AMD_IOMMU is not set
CONFIG_INTEL_IOMMU=y
CONFIG_INTEL_IOMMU_DEFAULT_ON=y
CONFIG_INTEL_IOMMU_FLOPPY_WA=y
# CONFIG_IOMMU_STRESS is not set

This is not to say there are no problems.  The 3.6 and 3.7
kernels are prone to freezing, with no mouse pointer motion,
no response to keyboard input, and no response to ping, about
once a week on this machine, but I don't know how to get any
diagnostics out when it happens.

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