I have an Toshiba Satellite p875-S7200. I have noticed that when I enable USB 
3.0 support in the BIOS i get the following error when I attemp to attach any 
USB device, to any USB port even the USB 2.0 ports.

Sep  2 11:48:33 joker kernel: xhci_do_command: Command timeout!
Sep  2 11:48:33 joker kernel: usb_alloc_device: device init 2 failed 
(USB_ERR_TIMEOUT, ignored)
Sep  2 11:48:33 joker kernel: ugen0.2: <Unknown> at usbus0 (disconnected)
Sep  2 11:48:33 joker kernel: uhub_reattach_port: could not allocate new 

When I disable USB 3.0 support in the BIOS, USB functions properly. Any ideas 
on what could be causing this? Please let me know what additional information 
you need.

FreeBSD 10.0-CURRENT #1: Sun Sep  2 06:02:47 EDT 2012 

xhci0: <Intel Panther Point USB 3.0 controller> mem 0xb8700000-0xb870ffff at 
device 20.0 on pci0
pcib0: matched entry for 0.20.INTA
pcib0: slot 20 INTA hardwired to IRQ 21
ioapic0: routing intpin 21 (PCI IRQ 21) to lapic 0 vector 59
xhci0: 32 byte context size.
usbus0 on xhci0
xhci0: usbpf: Attached
pci0: <simple comms> at device 22.0 (no driver attached)
ehci0: <Intel Panther Point USB 2.0 controller> mem 0xb8719000-0xb87193ff irq 
16 at device 26.0 on pci0
ioapic0: routing intpin 16 (PCI IRQ 16) to lapic 0 vector 60
usbus1: EHCI version 1.0
usbus1 on ehci0
ehci0: usbpf: Attached

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