Hi, sounds like you need to switch modes for the usb modem.
usb_storage or usbserial
Check this out...
# Last modified: 2008-05-06
# Configuration for usb_modeswitch, a mode switching tool for controlling
# flip flop (multiple device) USB gear
# Triggers the switching of several known UMTS modems from storage device mode
# ("ZeroCD TM" for use with MS Windows) to modem (serial) device mode
# Detailed instructions and a friendly forum on the homepage:
# Note: Timing of execution might be an issue (less so with recent
# versions of the tool). See homepage!
# What it all means:
# * DefaultVendor
# * DefaultProduct
# This is the ID the USB device shows after having been plugged in.
# The tool looks for this; if not found -> no action.
There is also a command rmmod, but you'll have to check on it's modern-day usage.
I use a huawei e220 usb 3g modem and had similar problems at first.
I have an example somewhere...(as soon as I find my reference, I will post it here.)
<edit> Check the module usage configs here...
For now, Glenn
Try this, rmmod -w usb_storage
The -w , allows all using the module to continue, but no new modules.
if the module is using usb_storage and not usbserial power management.
Hope this helps, remember to read up on the rmmod command first!
Also, lsusb and lspci may give more details.