[bugzilla-daemon@bugzilla.kernel.org: [Bug 206657] New: Lenovo C940 freeze during Thunderbolt3 dock connection/disconnection unless plugged before boot]

[Bjorn Helgaas <helgaas@kernel.org>]

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Date: Mon, 24 Feb 2020 20:55:05 +0000
From: bugzilla-daemon@bugzilla.kernel.org
To: bjorn@helgaas.com
Subject: [Bug 206657] New: Lenovo C940 freeze during Thunderbolt3 dock
	connection/disconnection unless plugged before boot
Message-ID: <bug-206657-41252@https.bugzilla.kernel.org/>

https://bugzilla.kernel.org/show_bug.cgi?id=206657

            Bug ID: 206657
           Summary: Lenovo C940 freeze during Thunderbolt3 dock
                    connection/disconnection unless plugged before boot
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.6-rc2
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PCI
          Assignee: drivers_pci@kernel-bugs.osdl.org
          Reporter: email-ext@laposte.net
        Regression: No

Created attachment 287591
  --> https://bugzilla.kernel.org/attachment.cgi?id=287591&action=edit
Dmesg log when disconnecting dock

Hello,

I have a Lenovo C940 under Manjaro with unstable packages and Kernel 5.6-rc2
using a OWC Thunderbolt3 dock. If I connect the dock before boot, it will work
correctly. However, if a connect/disconnect it after boot it won't be recognize
and will lead soon after to system crash. The gnome icons start to disappear
and when using commands on terminal input/output failure errors appear.

I found another bug which seems related to mine, but in my case it leads to
system crash:
https://bugzilla.kernel.org/show_bug.cgi?id=206459. 

I am encountering another problem with USB-C drive on thunderbolt3 ports
working if connected before boot and not otherwise. But without leading to
system crash:
https://bugzilla.kernel.org/show_bug.cgi?id=206649

I joined dmesg where disconnection starts at time 185 with some errors occuring
just after like:
[  184.038519] usb usb6: USB disconnect, device number 1
[  184.038523] usb 6-3: USB disconnect, device number 2
[  184.167256] usb 5-4: Not enough bandwidth for altsetting 1
[  184.167260] usb 5-4: 1:1: usb_set_interface failed (-19)

Also the journalctl shows some errors:

fév 23 17:55:06 pc-de-user kernel: usb usb6: USB disconnect, device number 1
fév 23 17:55:06 pc-de-user kernel: usb 6-3: USB disconnect, device number 2
fév 23 17:55:06 pc-de-user kernel: usb 5-4: Not enough bandwidth for altsetting
1
fév 23 17:55:06 pc-de-user kernel: usb 5-4: 1:1: usb_set_interface failed (-19)

Then the system crashes showing "input/output failures" just by using some
commands like "ls" or "cat".

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