Tecra S11-15T - GPRS modem doesn't work on internal USB port

My GPRS moden only works when I plug it into the dockingstation's USB port or if I use a USB port hub. If I plug it directly into the USB port on the laptop, I get an unknown device displayed in the device manager.
I have tried re-installing the chipset of my Toshiba Tecra S11-15T. I cannot get the device to work directly from the laptop's USB ports. I have WIN XP Professional.

Hi
Maybe the USB port does not provide enough power to get the modem working.
But all ports support the USB standards and every USB port is able to provide 500mA.
Possibly the modem needs more.
You can try to disable the USB power saving option.
In device manager, click right on USB root hub and go to Properties.
Then choose Power Management tab and uncheck the option; Allow the computer to turn off this device to save power

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