Thursday, 23 June 2022

Re: Jammy regressions

On Fri, Jun 24, 2022 at 01:32:14PM +0800, Daniel van Vugt wrote:
> Looking at jammy's remaining release regressions:
>
> https://bugs.launchpad.net/ubuntu/?field.searchtext=&search=Search&field.tag=jammy%20regression-release&field.tags_combinator=ALL&orderby=-heat&start=0
>
> It appears 21% of them are solvable (by most reports) using the kernel
> parameter "intel_iommu=off". Is this something the kernel team would
> consider?
>
> https://launchpad.net/bugs/1958191
> https://launchpad.net/bugs/1965882
> https://launchpad.net/bugs/1959041
> https://launchpad.net/bugs/1971146
>
> - Daniel

Hi Daniel,

we've already reverted the commit that enables intel_iommu by default
(see https://bugs.launchpad.net/bugs/1971699) and we are making sure
that this option is not re-enabled for now. The first jammy kernel with
this change is 5.15.0-40.43.

Obviously this doesn't mean that the original problem is fixed, there's
definitely something wrong happening in the Intel DMA remapping code
(and it seems to be an upstream issue), so it seems safer to keep it
disabled for now.

-Andrea

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