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

[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]

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

[bugzilla-daemon]

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

--- Comment #1 from Eric Zou (ezou@outlook.com) ---
I have a feeling that this bug shall actually be directly filed to 

https://gitlab.freedesktop.org/drm/amd

instead of here, but I am not sure.

Thanks.
Eric

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

[bugzilla-daemon]

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

The Linux kernel's regression tracker (Thorsten Leemhuis) (regressions@leemhuis.info) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |regressions@leemhuis.info

--- Comment #2 from The Linux kernel's regression tracker (Thorsten Leemhuis) (regressions@leemhuis.info) ---
(In reply to Eric Zou from comment #0)
>
> Since kernel 6.1.0-rc4 

So 6.1.0-rc3 worked?

Anyway: this is not my area of expertise, but a few fixes that might (or might
n not) be related to this were mainlined just this week. Could you hence maybe
try master or 6.1-rc7 (out later today)?

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

[bugzilla-daemon]

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

--- Comment #3 from Eric Zou (ezou@outlook.com) ---
Sorry I should have specified that I didn't try 6.1-rc3 so I don't know if that
works. I started 6.1 on rc4.

No problem I will try rc-7 today.

I also don't know exactly where to file bug report when I think it is related
to DRM. I just "think" it may be DRI(Non intel) but I really don't know
anything about it.

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

[bugzilla-daemon]

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

Eric Zou (ezou@outlook.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |OBSOLETE

--- Comment #4 from Eric Zou (ezou@outlook.com) ---
I will close this one now (if I can) to follow
https://gitlab.freedesktop.org/drm/amd/-/issues/2171

as I believe my issue is a duplicate of that.

Thanks
Eric

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

[bugzilla-daemon]

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

--- Comment #5 from The Linux kernel's regression tracker (Thorsten Leemhuis) (regressions@leemhuis.info) ---
(In reply to Eric Zou from comment #4)
> I will close this one now (if I can) to follow
> https://gitlab.freedesktop.org/drm/amd/-/issues/2171

It might (but TBH there is a second issue that recently was fixed that might be
the real cause), but then it should be fixed with rc7; and if not, please let
me know here (or by private mail)

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

[bugzilla-daemon]

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

--- Comment #6 from Eric Zou (ezou@outlook.com) ---
Hi Thorsten
Thanks for your attention. I will give you an update here:

I tried rc7 asap it was out as tarball. rc7 contains code changes that I
mentioned in https://gitlab.freedesktop.org/drm/amd/-/issues/2171 , and it
contains exactly the patches as they discussed on that thread and prediction of
what will work and not after the push to upstream to catch the release.

And my rc7 running result is a match of the progress so far from them. Allow me
to copy paste my post from yesterday:

-------------------------------------
1. The kernel crashed is gone so at least I don't need to force poweroff when
plug in the usb c cable to my USB-C dock Gen 2 (40AS)

2. Now my two monitors (FHD, connected to HDMI port on dock and FHD, connected
to DP port on dock) just don't detect that there is signal incoming.

3. (As a result of kernel crashed is gone) I can just unplug the cable and my
laptop just come back normally.
-------------------------------------

And thus the reason I believe I can close this one and follow them instead.

Sincerely
Eric

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