Public bug reported:

Starting with the following commit, upstream kernel is enabling Intel
IOMMU related options by default:

 792fb43ce2c9 ("iommu/vt-d: Enable Intel IOMMU scalable mode by
default")

We should follow upstream direction enabling
CONFIG_INTEL_IOMMU_DEFAULT_ON and
CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON.

A downside is that this change may introduce boot regressions on old
systems (especially those with buggy firmware).

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Affects: linux (Ubuntu Jammy)
     Importance: Undecided
         Status: Incomplete


** Tags: jammy

** Also affects: linux (Ubuntu Jammy)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1951440

Title:
  Enable CONFIG_INTEL_IOMMU_DEFAULT_ON and
  CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON on jammy 5.15

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