On Mon, 20 Mar 2023 11:26:39 +0200 Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> wrote: > This could be related to another case with two xHC controllers, but different vendors. > Bus numbers were interleaved there as well. Removing the asynch probe helped: > > https://lore.kernel.org/linux-usb/d5ff9480-57bd-2c39-8b10-988ad0d14a7e@xxxxxxxxxxxxxxx/ > > Does reverting: > 4c2604a9a689 usb: xhci-pci: Set PROBE_PREFER_ASYNCHRONOUS > help for you? Thanks for the hint Mathias! I'll check that out and report back. Which may take some weeks as this system is located at my parents home. Regards, Erhard