David Farrier wrote: > Unfortunately, trying different USB ports does not make any difference, as > all my external USB ports belong to the same controller. Would like to try > your other suggestion, unloading xhci_hcd and let the system fall back to > ehci_hcd. How do I do that? I tried blacklisting xhci_hcd, following the > instructions in the Debian Kernel Manual Chapter 6. When I rebooted, > xhci_hcd loaded anyhow. sudo rmmod xhci_hcd ?