MIME-Version: 1.0
From:   Chris Chiu <chris.chiu@canonical.com>
Date:   Thu, 9 Dec 2021 17:39:41 +0800
Message-ID: <CABTNMG0zcoCqVue8-3cJQ+iTPkJAgjxEN4FB6_ASX2rgXbWunw@mail.gmail.com>
Subject: 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>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

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