>> Can I enable this on the command line? Because I guess I need traces from startup when the dock is connected already. > I think you can add "trace_event=xhci-hcd" in the kernel command line to > get it enabled boot time. See: > > https://docs.kernel.org/trace/events.html#boot-option Hm, [ 0.029711] Kernel command line: bzImage.efi thunderbolt.dyndbg=+p trace_event=xhci-hcd root=PARTUUID=1761F245-C668-41F5-90E4-5BBF2224097A rootwait nomodeset ima_appraise=off [ 0.063715] Failed to enable trace event: xhci-hcd have to figure that out first... Regards, Christian