Bug#935245: Problem found

[David Purton <dcpurton@marshwiggle.net>]

I found the problem.

5.2.7-1 had
    # CONFIG_INTEL_IOMMU_DEFAULT_ON is not set

5.2.9-1 had
    CONFIG_INTEL_IOMMU_DEFAULT_ON=y

5.2.9-2 has
    # CONFIG_INTEL_IOMMU_DEFAULT_ON is not set
    CONFIG_INTEL_IOMMU_DEFAULT_ON_INTGPU_OFF=y

Only 5.2.7-1 boots on my system.

I can successfully boot 5.2.9-2 if I pass intel_iommu=off to the kernel
command line.