Here some more info on this subject with the debugger enabled...

usb_event_thread: start
usbd_new_device bus=0xc051b000 port=1 depth=1 lowspeed=0
usbd_new_device: addr=2, getting first desc failed
usbd_remove_device: 0xc053bc00
uhub_explore: usb_new_device failed, error=IOERROR
uhub0: device problem, disabling port 1
usbd_new_device bus=0xc051b000 port=2 depth=1 lowspeed=0
usbd_new_device: adding unit addr=2, rev=100, class=0, subclass=0,
protocol=0, maxpacket=8, len=18, ls=0
usbd_new_device: new dev (addr 2), dev=0xc053bb00, parent=0xc0512ac0
usbd_probe_and_attach: trying device specific drivers
usbd_probe_and_attach: no device specific driver found
usbd_probe_and_attach: looping over 1 configurations
usbd_set_config_index: (addr 2) attr=0x80, selfpowered=0, power=500
usbd_set_config_index: set config 1
usbd_probe_and_attach: no interface drivers found

cheerio Berndt
-- 
Name    : Berndt Josef Wulf            | +++ With BSD on Packet Radio +++
E-Mail  : wulf@ping.net.au             |    tfkiss, tnt, dpbox, wampes
ICQ     : 18196098                     |  VK5ABN, Nairne, South Australia 
URL     : http://www.ping.net.au/~wulf | MBOX : vk5abn@vk5abn.#lmr.#sa.au.oc
Sysinfo : DEC AXPpci33+, NetBSD-1.4.2  | BBS  : vk5abn.#lmr.#sa.aus.oc