This bug is awaiting verification that the linux-
oracle-5.15/5.15.0-1006.8~20.04.1 kernel in -proposed solves the
problem. Please test the kernel and update this bug with the results. If
the problem is solved, change the tag 'verification-needed-focal' to
'verification-done-focal'. If the problem still exists, change the tag
'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-focal

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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

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Jammy:
  Fix Released

Bug description:
  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).

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