[Bug 219422] New: Hard crash when USB4 cable is disconnected during sleep

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219422

            Bug ID: 219422
           Summary: Hard crash when USB4 cable is disconnected during
                    sleep
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: me@68x.ca
        Regression: No

Created attachment 307062
  --> https://bugzilla.kernel.org/attachment.cgi?id=307062&action=edit
Error after USB4 cable is disconnected and

Hi, my current setup is a Lenovo Legion Go with a USB4 based external GPU (Onex
GPU with a 7600M XT). I am running these tests on EndeavorOS with 6.12 rc4
kernel and stock 6.11.2-arch kernel.

My device crashes and hard locks when the USB4 cable is disconnected or when
the device is not inaccessible upon a sleep and wake cycle.

I have been able to reliably crash system with this external GPU with the
following steps:

1. Connect my eGPU dock
2. Wait a few seconds
3. Put the device to sleep
4. Wait for the device to sleep
5. Disconnect the USB4 cable
6. Wake the device up and the system will hard lock

I attached a photo of the logs. The error message is: 'Unable to change power
state from Dcold to DO, device inaccessible' and this occurs for all PCI
devices on the USB4 dock. 

The above also occurs intermittently even when I have the cable attached.


To isolate if it was my device or the USB4 eGPU enclosure, I have also tried a
Thunderbolt 3 laptop dock and that works reliably. I am able to disconnect the
TB3 device during sleep and my system successfully recovers.

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