Hi Mario, In my case in both cases the value for: $ cat /sys/bus/thunderbolt/devices/domain0/iommu_dma_protection is 0. Output of sudo journalctl -k with kernel option thunderbolt.dyndbg=+p: https://codeshare.io/qAXLoj Output of sudo dmesg with kernel option thunderbolt.dyndbg=+p: https://codeshare.io/zlPgRb Output of sudo journalctl -k with kernel options thunderbolt.dyndbg=+p thunderbolt.host_reset=false: https://codeshare.io/Lj3rPV Output of sudo dmesg with kernel option thunderbolt.dyndbg=+p thunderbolt.host_reset=false: https://codeshare.io/beQw36 Best Giacomo On Mon, May 20, 2024 at 4:41 PM Mario Limonciello <mario.limonciello@xxxxxxx> wrote: > > On 5/20/2024 09:39, Christian Heusel wrote: > > On 24/05/06 02:53PM, Linux regression tracking (Thorsten Leemhuis) wrote: > >> [CCing Mario, who asked for the two suspected commits to be backported] > >> > >> On 06.05.24 14:24, Gia wrote: > >>> Hello, from 6.8.7=>6.8.8 I run into a similar problem with my Caldigit > >>> TS3 Plus Thunderbolt 3 dock. > >>> > >>> After the update I see this message on boot "xHCI host controller not > >>> responding, assume dead" and the dock is not working anymore. Kernel > >>> 6.8.7 works great. > > > > We now have some further information on the matter as somebody was kind > > enough to bisect the issue in the [Arch Linux Forums][0]: > > > > cc4c94a5f6c4 ("thunderbolt: Reset topology created by the boot firmware") > > > > This is a stable commit id, the relevant mainline commit is: > > > > 59a54c5f3dbd ("thunderbolt: Reset topology created by the boot firmware") > > > > The other reporter created [a issue][1] in our bugtracker, which I'll > > leave here just for completeness sake. > > > > Reported-by: Benjamin Böhmke <benjamin@xxxxxxxxxxx> > > Reported-by: Gia <giacomo.gio@xxxxxxxxx> > > Bisected-by: Benjamin Böhmke <benjamin@xxxxxxxxxxx> > > > > The person doing the bisection also offered to chime in here if further > > debugging is needed! > > > > Also CC'ing the Commitauthors & Subsystem Maintainers for this report. > > > > Cheers, > > Christian > > > > [0]: https://bbs.archlinux.org/viewtopic.php?pid=2172526 > > [1]: https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/48 > > > > #regzbot introduced: 59a54c5f3dbd > > #regzbot link: https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/48 > > As I mentioned in my other email I would like to collate logs onto a > kernel Bugzilla. With these two cases: > > thunderbolt.dyndbg=+p > thunderbolt.dyndbg=+p thunderbolt.host_reset=false > > Also what is the value for: > > $ cat /sys/bus/thunderbolt/devices/domain0/iommu_dma_protection
