[mythtv-users] Enabling IOMMU seems to have broken my tuners

[Gary Buhrmaster]

On Fri, Jan 27, 2023 at 4:58 PM George Bingham <georgeb1962 at gmail.com> wrote:

>> * What is your distro/version?
>
>
> Ubuntu 22.04, 5.15.0-58-generic

Are you using an AMD Renior/Cezanne system?
There is a kernel patch that fixes a specific issue
with those systems and IOMMU for some core
media tuners that even calls out MythTV as an
impacted app and first identified on a 5.15 kernel
(other generations of related implementations
might also be impacted).  Looks like it might
need a (very) recent kernel to fix (the patch did
not go into mainline until August of 2022, which
would likely mean 6.0.x), although it might have
gotten backported in some distros.

In any case, I suspect that upstream will require
you to test with a recent kernel before accepting
a bug report.