i noticed similar behavior under ubuntu 7.10 with a belkin wireless USB
device.  Specifically, my wireless networking stops working and network
manager becomes unresponsive when I unplug the device and plug it back
in.  A proper system restart or shutdown also freezes the computer when
it reaches the point where the network services are being terminated (I
have to it the power button to manually shut down).  Here's some output
from various system resources that may be helpful:

uname -a:
Linux durden 2.6.22-14-generic #1 SMP Tue Dec 18 05:28:27 UTC 2007 x86_64 
GNU/Linux

lsusb:
Bus 005 Device 002: ID 050d:705c Belkin Components 
Bus 005 Device 001: ID 0000:0000  
Bus 003 Device 001: ID 0000:0000  
Bus 004 Device 001: ID 0000:0000  
Bus 002 Device 001: ID 0000:0000  
Bus 001 Device 004: ID 046d:c512 Logitech, Inc. 
Bus 001 Device 001: ID 0000:0000

lsmod | grep usb:
usbhid                 32576  0 
hid                    33408  1 usbhid
usbcore               161584  5 zd1211rw,usbhid,ehci_hcd,uhci_hcd

in /var/log/syslog these lines are repeated several times:
Dec 24 00:32:50 durden kernel: [ 5723.676241] zd1211rw 5-1:1.0: 
zd_chip_control_leds error -19
Dec 24 00:32:50 durden kernel: [ 5724.296166] zd1211rw 5-1:1.0: error 
ioread32(CR_REG1): -19

Please let me know if there's any other info I can provide that would
help.  Thanks.

-- 
usb wireless device zd1211rw 5-2:1.0: zd_chip_control_leds error -19
https://bugs.launchpad.net/bugs/74362
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