Re: Discrete Thunderbold Controller 8086:1137 throws DMAR and thunderbolt fails to work

[Chris Chiu]

On Thu, Dec 9, 2021 at 5:39 PM Chris Chiu <chris.chiu@xxxxxxxxxxxxx> wrote:
>
> Hi,
>     We created a ticket
> https://bugzilla.kernel.org/show_bug.cgi?id=215265 that is pretty
> similar to https://bugzilla.kernel.org/show_bug.cgi?id=214259. So I
> tried the patch on https://lkml.org/lkml/2020/6/17/751 but it doesn't
> fix the issue. I also tried to boot with the kernel parameter
> `pci=nocrs` but it changed nothing either. I attached the kernel log
> with thunderbolt dynamic debug on and lspci output on the ticket. Also
> tried to disable the intel_iommu, the DMAR failure seems to go away
> but thunderbolt still fails to work. Can anyone suggest what kind of
> information is required to help identify the cause of the problem?
> Thanks
>
> Chris

Gentle ping. Mika, could you give some advice on this? Thanks