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From:   Chris Chiu <chris.chiu@canonical.com>
Date:   Mon, 13 Dec 2021 13:37:10 +0800
Message-ID: <CABTNMG1-ZzoKr024G1beGdZyNONbRp0_1mpeTRnDXcEuE_VNkA@mail.gmail.com>
Subject: Re: Discrete Thunderbold Controller 8086:1137 throws DMAR and
 thunderbolt fails to work
To:     andreas.noever@gmail.com, michael.jamet@intel.com,
        mika.westerberg@linux.intel.com, YehezkelShB@gmail.com
Cc:     linux-usb@vger.kernel.org,
        Linux Kernel <linux-kernel@vger.kernel.org>
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On Thu, Dec 9, 2021 at 5:39 PM Chris Chiu <chris.chiu@canonical.com> 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