linux-kernel - Re: [REGRESSION] Thunderbolt Host Reset Change Causes eGPU Disconnection from 6.8.7=>6.8.8

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Message-ID: <9659dd5d-af8d-4100-8fc1-ceca42223827@amd.com>
Date: Mon, 20 May 2024 08:43:25 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Gia <giacomo.gio@...il.com>,
 Linux regressions mailing list <regressions@...ts.linux.dev>
Cc: linux-kernel@...r.kernel.org,
 "stable@...r.kernel.org" <stable@...r.kernel.org>, kernel@...ha.zone
Subject: Re: [REGRESSION] Thunderbolt Host Reset Change Causes eGPU
 Disconnection from 6.8.7=>6.8.8

Can we please get some kernel logs for these two cases on the command line?

thunderbolt.dyndbg=+p
thunderbolt.dyndbg=+p thunderbolt.host_reset=false

Also what is the value for:

$ cat /sys/bus/thunderbolt/devices/domain0/iommu_dma_protection

That won't change in the two cases, but it will be really helpful to 
understand this issue.

On 5/20/2024 04:19, Gia wrote:
> Hi Thorsten,
> 
> I'll try to provide a kernel log ASAP, it's not that easy because when
> I run into this issue my keyboard isn't working. The kernel parameter
> that Mario suggested, thunderbolt.host_reset=false, fixes the issue!
> 
> I can add that without the suggested kernel parameter the issue
> persists with the latest Archlinux kernel 6.9.1.
> 
> I also found another report of the issue on Archlinux forum:
> https://bbs.archlinux.org/viewtopic.php?id=295824
> 
> 
> On Mon, May 6, 2024 at 2:53 PM Linux regression tracking (Thorsten
> Leemhuis) <regressions@...mhuis.info> wrote:
>>
>> [CCing Mario, who asked for the two suspected commits to be backported]
>>
>> On 06.05.24 14:24, Gia wrote:
>>> Hello, from 6.8.7=>6.8.8 I run into a similar problem with my Caldigit
>>> TS3 Plus Thunderbolt 3 dock.
>>>
>>> After the update I see this message on boot "xHCI host controller not
>>> responding, assume dead" and the dock is not working anymore. Kernel
>>> 6.8.7 works great.
>>
>> Thx for the report. Could you make the kernel log (journalctl -k/dmesg)
>> accessible somewhere?
>>
>> And have you looked into the other stuff that Mario suggested in the
>> other thread? See the following mail and the reply to it for details:
>>
>> https://lore.kernel.org/all/1eb96465-0a81-4187-b8e7-607d85617d5f@gmail.com/T/#u
>>
>> Ciao, Thorsten
>>
>> P.S.: To be sure the issue doesn't fall through the cracks unnoticed,
>> I'm adding it to regzbot, the Linux kernel regression tracking bot:
>>
>> #regzbot ^introduced v6.8.7..v6.8.8
>> #regzbot title thunderbolt: TB3 dock problems, xHCI host controller not
>> responding, assume dead