[Bug 219748] Pluggable UD-4VPD dock appears to continually reset with AMD AI 365

bugzilla-daemon
2025-03-05T09:26:33Z

--- Comment #20 from Mika Westerberg (mika.westerberg@linux.intel.com) ---
(In reply to Sean from comment #18)
> Created attachment 307767 [details]
> dmesg after Scan downstream retimers after the router patch
>
> While this topic is related to a Plugable dock, the Thunderbolt
> implementation is having some issues for AMD GPUs where display EDIDs can't
> be read (https://gitlab.freedesktop.org/drm/amd/-/issues/3050). This latest
> patch appears to have helped that issue, as my TB3 Lenovo dock on a
> Framework 16 with an AMD 7840HS CPU is now able to use its display outputs
> at the correct resolutions. I'll be testing with addition TB docks I have
> access to in the near future as well.

I suggest opening separate issue for this. I don't see how this patch could
affect GPU reading EDID from monitor. Assuming it is over DisplayPort tunnel,
at that point the device router is already enumerated. This patch just speeds
up the enumeration to cope with the Pluggable device internal timeout.

Please attach full dmesg with "thunderbolt.dyndbg=+p" in the command line too
to that new issue.