usb pen drive not detecting

 hi

 I cant get bsd to detect any usb pen drives on my system. I have a generic
 kernel with a few extra options that i cant see causing any issues.
 I do get a few kernel messages when I plug the drive in (see below). The 
pen
 drives are plugged directly into the usb headers on the back of the
 motherboard ie not the kvm (which works)
 I'm happy to supply any extra debug information


 usbd_req_re_enumerate:1539: addr=4, set address failed! (USB_ERR_TIMEOUT,
 ignored)
 Root mount waiting for: usbus4
 usbd_req_re_enumerate:1553: getting device descriptor at addr 4 failed,
 USB_ERR_TIMEOUT!
 ugen4.4: <(null)> at usbus4 (disconnected)
 uhub_reattach_port:435: could not allocate new device!

 $ usbconfig
 ugen2.1: <UHCI root HUB Intel> at usbus2, cfg=0 md=HOST spd=FULL (12Mbps)
 pwr=ON
 ugen3.1: <UHCI root HUB Intel> at usbus3, cfg=0 md=HOST spd=FULL (12Mbps)
 pwr=ON
 ugen4.1: <EHCI root HUB Intel> at usbus4, cfg=0 md=HOST spd=HIGH (480Mbps)
 pwr=ON
 ugen0.1: <UHCI root HUB Intel> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps)
 pwr=ON
 ugen1.1: <UHCI root HUB Intel> at usbus1, cfg=0 md=HOST spd=FULL (12Mbps)
 pwr=ON
 ugen4.2: <product 0x6560 vendor 0x04b4> at usbus4, cfg=0 md=HOST spd=HIGH
 (480Mbps) pwr=SAVE
 ugen4.3: <USB KVM vendor 0x0d3d> at usbus4, cfg=0 md=HOST spd=LOW (1.5Mbps)
 pwr=ON

 $ uname -a
 FreeBSD X 8.0-BETA2 FreeBSD 8.0-BETA2 #2: Sat Jul 18 23:29:28 BST 2009
 root_at_x:/usr/obj/usr/src/sys/me  amd64


 $ cat /sys/amd64/conf/me
 include GENERIC


 options         KDTRACE_FRAME           # Ensure frames are compiled in
 options         KDTRACE_HOOKS           # Kernel DTrace hooks


 options         ALTQ
 options         ALTQ_CBQ
 options         ALTQ_RED
 options         ALTQ_RIO
 options         ALTQ_HFSC
 options         ALTQ_CDNR
options         ALTQ_PRIQ
 options         ALTQ_NOPCC

device carp
 options COM_MULTIPORT
 device puc