On Thu, May 12, 2011 at 09:33:32AM +0100, Simon Leung wrote:

quoted

quoted

But the problem here is that pl2303 should not be loaded at all as
it's for USB-serial adapter, not 3G modem. I'm not sure what controls
that.

The descriptors of the device itself.

What does 'lsusb' show with this device plugged in?
And what kernel version are you using here?

I'm using 2.6.21 on an ARM board. lsusb says:
|12d1:1446
after usb_modeswitch:
||12d1:1001

2.6.21 is _very_ old and unsupported, please use a modern kernel if you
need to ask the community for help.  If you are stuck with this version
for some reason, please contact the vendor that is providing you support
for this as you are paying them for this.

If you can reproduce this with the 2.6.38 kernel release, or newer, I'll
be glad to help you out.

thanks,

greg k-h