[SRU][J][PATCH 0/1] disable Intel DMA remapping by default

[Andrea Righi]

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

[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.