netdev - XHCI/Realtek 8152: Network interface of USB-C mini dock does not show up

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Message-ID: <2825a424-eedf-4887-943b-4477fc367ffc@molgen.mpg.de>
Date: Wed, 19 Feb 2025 18:11:10 +0100
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Andrew Lunn <andrew@...n.ch>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Mathias Nyman <mathias.nyman@...el.com>
Cc: Hayes Wang <hayeswang@...ltek.com>, linux-usb@...r.kernel.org,
 netdev@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: XHCI/Realtek 8152: Network interface of USB-C mini dock does not show
 up

Dear Linux folks,

On the Intel Kaby Lake laptop Dell XPS 13 9360, I suspended it on one 
location and detached the Dell DA300 USB-C “mini dock” there, and at a 
different place resumed it from ACPI S3 and plugged in an LMP mini Dock. 
As happens sometimes before, the network interface wasn’t detected 
(`drivers/net/usb/r8152.c`). Normally re-plugging works, but this time, 
and didn’t. Only suspending the system and resuming fixed it. I enabled 
USB dynamic debug with

     echo 'file drivers/usb/* +p' | sudo tee 
/sys/kernel/debug/dynamic_debug/control

after it didn’t work for some time.

Please find the Linux messages attached. It should start from

     [30591.582919] PM: suspend entry (deep)

on.

It may be related to the issue I reported last year, analyzed by Mathias 
already but I didn’t respond yet [1].

No other devices are attached to the USB-C mini dock.

Kind regards,

Paul

[1]: 
https://lore.kernel.org/all/785ddb6f-dca2-466d-c4bb-a6723a51e3e8@linux.intel.com/
      "Re: xhci_hcd: `Timeout while waiting for setup device command`, 
37 s until Ethernet connection is established"
[2]: https://lmp-adapter.com/product/lmp-usb-c-mini-dock/
View attachment "20250219--dell-xps-13-9360--linux-6.14-rc3+.txt" of type "text/plain" (445952 bytes)