Comment 5 for bug 875441
Revision history for this message
| almursi (haqqshahid) wrote Re: ZTE MF190, try to connect on bad ttyUSB2 | #5 |
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0e1f616
(Get the code!)
A comment that I found interesting (about another ZTE MF190 variant):
http://
Josh
Posted: Thu Aug 11, 2011 7:27 am
It's the old problem of Network Manager, or more precisely the helper component modem-manager, sometimes not using the correct port for connection out of the several ttyUSB interfaces a 3G modem is providing.
Not all modems want to be used with ttyUSB0; it's common for ZTE devices to connect via ttyUSB2 or ttyUSB3.
The common property of the "correct" ports is that they have a transfer type of "interrupt". usb_modeswitch will check for this and add a symlink "gsmmodem" in the /dev folder which points to the right port.
I know that the main developer of modem-manager was not aware of the interrupt thing until recently. Future versions may work as expected.
For now, the problem is that modem-manager may pick a port that responds to AT commands but will do so only for diagnostic purposes. Since there is no manual override for the port in Network Manager, all you can do is to use alternative software which allows the setting of the port.