[Bug 1971699] Re: disable Intel DMA remapping by default

This bug is awaiting verification that the linux-aws/6.8.0-1009.9 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-noble-linux-aws' to 'verification-done-noble-linux-
aws'. If the problem still exists, change the tag 'verification-needed-
noble-linux-aws' to 'verification-failed-noble-linux-aws'.


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: kernel-spammed-noble-linux-aws-v2 verification-needed-noble-linux-aws

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https://bugs.launchpad.net/bugs/1971699

Title:
disable Intel DMA remapping by default

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

Bug description:
[Impact]

It seems that enabling Intel IOMMU can cause some weird gfx problems, see for example:

https://bugs.launchpad.net/bugs/1971146
https://bugs.launchpad.net/bugs/1965882

[Test case]

We don't have any specific test case, only other bug reports that
tracked down the origin of the issue as being introduced when
CONFIG_INTEL_IOMMU_DEFAULT_ON has been enabled by default.

[Fix]

Revert "UBUNTU: [Config] enable Intel DMA remapping options by
default"

[Regression potential]

DMA remapping device not present at boot by default, users that
require this feature will need to specifically add intel_iommu=on to
the kernel boot parameters to enable it.

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