Re: Possible problem with thunderbolt 4

[Mika Westerberg <mika.westerberg@linux.intel.com>]

Hi,

On Tue, May 23, 2023 at 10:22:28AM +0200, Christian Schaubschläger wrote:
> Hi Mika,
> 
> it seems that I have an issue here which seems similar to the one on the HP earlier this year.
> 
> This time the hardware is a Dell Latitude 7440 with a rather new Intel i5-1345U (13th Gen.) and TB4. I have three Docks, one older Dell WD19TB, a newer Dell WD22TB4, and a ThinkPad Universal USB-C Dock.
> With the TB4 dock everything works fine (meaning all hardware is functioning in the UEFI firmware as well as in Windows after booting Linux first).
> 
> With the older TB dock, as well as with the USB-C dock the network interface on the dock is dead after Linux. But in contrast to the HP case from earlier this year, this time the network interface remains dead when I boot Linux again. After replugging the dock it becomes alive again.
> 
> This can easilsy be reproduced by booting Ubuntu 22.04 from an USB device. Using a newer kernel with the UNSET_INBOUND_SBTX fix does not solve the issue.
> 
> I'm not sure if this is a USB or Thunderbolt issue, could be an issue with the network device, too (all three docks have the same Realtek 8153). But I don't see this problem with these docks on other Laptops I have access to, so probably it's not the network device...
> 
> Can I provide some logs, etc. to dive deeper into this?

Sure, I suggest also start a new email thread or file a kernel.org
bugzilla ticket.

Can you add "thunderbolt.dyndbg=+p" in the kernel command line and
reproduce the issue and share the full dmesg?