current couldn't attach usb mouse

Hi, all

I have a dell optiplex 745 box with a dell usb mouse. I update system from  
7.1 to current today,
after that the usb mouse could not recongnize. I got some message from  
dmesg like below:

uhci_interrupt: host system error
uhci_interrupt: host system error
usb2_alloc_device:1574: set address 2 failed (USB_ERR_TIMEOUT, ignored)
usb2_alloc_device:1612: getting device descriptor at addr 2 failed,  
USB_ERR_TIMEOUT!
uhci_interrupt: host system error
usb2_req_re_enumerate:1519: addr=2, set address failed! (USB_ERR_TIMEOUT,  
ignored)
usb2_req_re_enumerate:1533: getting device descriptor at addr 2 failed,  
USB_ERR_TIMEOUT!
uhci_interrupt: host system error
usb2_req_re_enumerate:1519: addr=2, set address failed! (USB_ERR_TIMEOUT,  
ignored)
usb2_req_re_enumerate:1533: getting device descriptor at addr 2 failed,  
USB_ERR_TIMEOUT!
ugen1.2: <> at usbus1 (disconnected)
uhub_reattach_port:417: could not allocate new device!

my current is up to date current,

[root_at_currentpark] ~# sysctl kern.osreldate
kern.osreldate: 800085

[root_at_currentpark] ~# uname -a
FreeBSD currentpark.intra.umessage.com.cn 8.0-CURRENT FreeBSD 8.0-CURRENT  
#0: Mon May  4 17:46:54 CST 2009      
root_at_currentpark.intra.umessage.com.cn:/usr/obj/usr/src/sys/GENERIC  amd64

Is this a usb2.0's bug or I should configure something else?

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