> a couple of years ago you gave me a technique for stopping part of usb and 
> then restarting it with debug turned on (done from a usb keyboard).
> 

ls /dev/usb
echo noauto kb >/dev/usbdctl
# plug in the new keyboard
ls /dev/usb
# observe the name of the new device /dev/usb/epN.0 which should have appeared
usb/kb -ddd /dev/usb/epN.0


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