Hey Linux enthusiasts!

I’ve run into an issue: after a random upgrade, my Thunderbolt dock stopped working on Linux. It still works fine on Windows, and interestingly, if I first connect it to a Windows laptop and then replug it into my Dell running Linux, it works. So the dock itself is fine — the problem seems to be software-related.

I’ve also noticed that roughly 1 out of 10 times when I plug and unplug the TB4 cable, the monitor turns on. That’s really strange, especially since everything works consistently on Windows.

My guess is that the issue is related to Thunderbolt security levels and authorization, but I haven’t been able to figure it out yet. I’ve tried different kernel versions and even downgraded the dock’s firmware. Maybe I’m missing something, but so far, nothing has helped.

My lapve tried with some bios setting for TB, secure boot disabling - but it also doesn't help

I've attached logs for dbmesg, fwmngr, dell's update utiltiy, boltctl

I couldn't format logs on inner editor, that why moved them to google doc
My google doc with logs


My next todos are
1. Check it on bootable USB with other distors
2. Research these threads:
https://askubuntu.com/questions/1534913/issues-with-thunderbolt-and-initramfs-in-ubuntu-24-devices-assume-blocked
https://gitlab.freedesktop.org/bolt/bolt/-/issues/187


My bios photos