On Tue, May 8, 2012 at 12:50 PM, Vince Huang <axish...@foxmail.com> wrote:
> I did have tried to plug a usb hub even with power supply first.But the same 
> happens.The only maybe effect is too make the problem happen a little bit 
> later.

I have also noticed this with TP-WR703n and a USB 3G modem, and just
noticed a deauthorize / authorize cycle to the USB host controller
driver enables the device again. I don't remember the exact path right
now, but something like the following works:

$ echo 0 > /sys/bus/usb/devices/DEVICE/authorized
$ echo 1 > /sys/bus/usb/devices/DEVICE/authorized
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