Hi Thomas,
thank you for the help to gather more information.
I added "initcall_debug" in grub and tested the suspend / cpu-lockup problem
after a rebooting into the new grub config.
I tried it different times, and can say, that the connected Thunderbolt
dock was not the problem, as the cpu-lock
Public bug reported:
Sometimes the kernel hangs after resuming from suspend.
It might be a problem when suspending, while the DELL thunderbolt dock is
connected.
ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: linux-image-5.13.0-25-generic 5.13.0-25.26
ProcVersionSignature: Ubuntu 5.13.0-2
** Information type changed from Public to Public Security
** Information type changed from Public Security to Private Security
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https://bugs.launchpad.net/bugs/1856653
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