This behaviour also found when using USB ADSL modem. Though the hardware 
(Huawei WA1003A) is compatible with ueagle-atm driver, driver is not loaded 
when usb is plugged in.  i need to perform someting like below: 
 sudo echo -n 1 > /sys/bus/usb/devices/2-2/bConfigurationValue 
to get the driver loaded and interface created. After a heavy network traffic 
(or after a while) the usb  gets disabled. Below are the relevant messages:

[81918.704000] hub 2-0:1.0: port 2 disabled by hub (EMI?), re-enabling...
[81918.704000] usb 2-2: USB disconnect, address 9
[81918.816000] usb 2-2: new full speed USB device using uhci_hcd and address 10
[81919.004000] usb 2-2: no configuration chosen from 1 choice

uname -a
Linux sarvothma 2.6.20-16-generic #2 SMP Wed May 23 01:46:23 UTC 2007 i686 
GNU/Linux

-- 
USB device detection problems in 2.6.20
https://bugs.launchpad.net/bugs/102659
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