[Bug 2083182] Re: The system hangs after resume with thunderbolt monitor(AMD GPU [1002:1900])

This bug is awaiting verification that the linux-
realtime-6.11/6.11.0-1003.3~24.04.2 kernel in -proposed solves the
problem. Please test the kernel and update this bug with the results. If
the problem is solved, change the tag 'verification-needed-noble-linux-
realtime-6.11' to 'verification-done-noble-linux-realtime-6.11'. If the
problem still exists, change the tag 'verification-needed-noble-linux-
realtime-6.11' to 'verification-failed-noble-linux-realtime-6.11'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-noble-linux-realtime-6.11-v2 verification-needed-noble-linux-realtime-6.11

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https://bugs.launchpad.net/bugs/2083182

Title:
The system hangs after resume with thunderbolt monitor(AMD GPU
[1002:1900])

Status in HWE Next:
New
Status in linux package in Ubuntu:
Invalid
Status in linux-oem-6.11 package in Ubuntu:
Invalid
Status in linux source package in Noble:
Fix Released
Status in linux-oem-6.11 source package in Noble:
Fix Released
Status in linux source package in Oracular:
Fix Released
Status in linux-oem-6.11 source package in Oracular:
Invalid

Bug description:
[Impact]
The system hangs on blackscreen with thunderbolt monitor while resume from suspend state.

[Fix]
The TBT monitor HPD will be triggered during the resume procedure
and call the drm_client_modeset_probe() while
struct drm_connector connector->dev->master is NULL.

It will mess up the pipe topology after resume.

AMD submitted a patch to fix this issue.
https://lore.kernel.org/all/20240927170103.102180-3-Jerry.Zuo@amd.com/T/#e868f6b967ec79ae85c5a8a446be9b5d5c97e5427

[Test case]
1. Boot to OS
2. Plug thunderbolt monitor to the system.
3. Enter suspend
4. Press the power button to resume from suspend
5. Should not hang

[Where problems could occur]
Pretty low chance to introduce any regressions.
The patch won't do anything bad to the system while resuming,
the probing will be done after resumed.

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