Date:   Mon, 13 Dec 2021 08:11:21 +0200
From:   Mika Westerberg <mika.westerberg@linux.intel.com>
To:     Chris Chiu <chris.chiu@canonical.com>
Cc:     andreas.noever@gmail.com, michael.jamet@intel.com,
        YehezkelShB@gmail.com, linux-usb@vger.kernel.org,
        Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Discrete Thunderbold Controller 8086:1137 throws DMAR and
 thunderbolt fails to work
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References: <CABTNMG0zcoCqVue8-3cJQ+iTPkJAgjxEN4FB6_ASX2rgXbWunw@mail.gmail.com>
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On Mon, Dec 13, 2021 at 01:37:10PM +0800, Chris Chiu wrote:
> 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

Hm, didn't I already answered?

https://lore.kernel.org/linux-usb/YbHVryQ+QTnyMmTB@lahna/