Comment 3 for bug 408555

Many tests done and the system behavior is very bad when network manager and modem manager running, after ejecting the created CDROM. Partially freeze on terminal, cannot open a new terminal or complete freeze of the system. I can understand 'no connection' but 'loosing' the system is a real 'bug'.

After a clean install of Ubuntu 9.10 Alpha 4 my best way to connect with ZTE MF636 modem:

0- boot without the modem, wait for the system to load
1- stop network manager
2- check that wvdial is not running (no process)
3- find process number of modem-manager
4- kill modem-manager
5- attach modem
6- check lsusb: 19d2:2000 (CDROM)
7- wait and eject CDROM created (sr0)
8- check again lsusb: 19d2:0031 (modem)
9- check creation of /dev/ttyUSB0-1-2
a- connect using wvdial and port /dev/ttyUSB2
b- checked that the connection done: valid IP, DNS

******* code

g@KKa4:~$ sudo /etc/init.d/NetworkManager stop
[sudo] password for g:
 * Stopping network connection manager NetworkManager [ OK ]
g@KKa4:~$ ps -A | grep wvdial
g@KKa4:~$ ps -A | grep modem
 1494 ? 00:00:00 modem-manager
g@KKa4:~$ sudo kill 1494
g@KKa4:~$ ps -A | grep modem
g@KKa4:~$ lsusb
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 004: ID 19d2:2000 ONDA Communication S.p.A.
Bus 001 Device 003: ID 04f2:b071 Chicony Electronics Co., Ltd 2.0M UVC WebCam / CNF7129
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
g@KKa4:~$ sudo eject sr0
g@KKa4:~$ lsusb
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 005: ID 19d2:0031 ONDA Communication S.p.A.
Bus 001 Device 003: ID 04f2:b071 Chicony Electronics Co., Ltd 2.0M UVC WebCam / CNF7129
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
g@KKa4:~$ dmesg | grep ttyUSB
[ 224.005998] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB0
[ 224.008440] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB1
[ 224.009049] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB2
g@KKa4:~$ sudo wvdial 2
--> WvDial: Internet dialer version 1.60
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: AT&F
AT&F
OK
--> Sending: AT+CGDCONT=1,"IP","gint.b-online.gr"
AT+CGDCONT=1,"IP","gint.b-online.gr"
OK
--> Modem initialized.
--> Sending: ATDT*99***1#
--> Waiting for carrier.
CONNECT
--> Carrier detected. Starting PPP immediately.
--> Starting pppd at Fri Aug 14 14:58:32 2009
--> Pid of pppd: 2420
--> Using interface ppp0
--> local IP address 212.152.101.199
--> remote IP address 10.64.64.64
--> primary DNS address 212.152.70.6
--> secondary DNS address 212.152.70.7

******* /code

Trying to get debug log from modem manager all system got frozen (totally).
I am still in progress to find a way to get this log.

Regards,
George