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-lockup also happens, when the laptop was not connected to anything. It is not happening on each suspend, but after some rounds of suspend+resume I can see the problem. In the attachment is the kern.log with two incidents, the last one took quite a while (8000s). If you have any other idea or have things I can test, I am happy to help! Best regards, Michael ** Attachment added: "kernel.log.tgz" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1957808/+attachment/5560417/+files/kernel.log.tgz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1957808 Title: Kernel soft lockup after resume To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1957808/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
