[Bug 216745] New: Kernel 6.1 breaks Thinkpad T14 Gen 2 AMD connection to USB-C dock Gen 2 with kernel Null pointer

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216745

            Bug ID: 216745
           Summary: Kernel 6.1 breaks Thinkpad T14 Gen 2 AMD connection to
                    USB-C dock Gen 2 with kernel Null pointer
           Product: Drivers
           Version: 2.5
    Kernel Version: 6.1.0-rc6
          Hardware: AMD
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: ezou@outlook.com
        Regression: No

Created attachment 303299
  --> https://bugzilla.kernel.org/attachment.cgi?id=303299&action=edit
journal output with DRM debug set to 0xf

Full description of the problem:
Connecting T14 Gen 2 AMD to Thinkpad USB C Dock Gen 2 via USB-C on DP Alt mode.

Since kernel 6.1.0-rc4 (and rc 5, rc 6), once the usb c cable is plug in, the
dock and computer detected the connection by blinking on both power buttons (on
laptop and dock), and then the laptop became completely unresponsive, has to be
powered off by long press on power button. Based on the journal output it looks
like something about DRM and AMDGPU, and Kernel null pointer (and oops
message).

Keywords: 
DRM, AMDGPU

Most recent kernel version which did not have the bug:
Tried 5.19.17, 6.0.10 and it's working.

A journal output with DRM debug value set to 0xf is attached.

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