One striking difference between the two modem-manager.logs is that in 11.10 there is communication with ttyUSB1 in parallel, whereas in 11.04 it is "type ignored" after the probing.
The commands that are going to ttyUSB0 seem not to be different in both logs, but the response from there stops at the moment the command "AT+CGREG=2" is sent to ttyUSB1 (log from 11.10). This is supposed to switch on unsolicited status output on that port, to monitor the signal and other parameters during a connection. This seems to be a fundamental difference in the modem handling between 11.04 and 11.10. I'm not familiar with the NM/MM code though, so I can't give further assistance here. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/868034 Title: Huawei E220 can't connect on Ubuntu 11.10 Status in “linux” package in Ubuntu: Confirmed Status in “network-manager” package in Ubuntu: Confirmed Bug description: I'm using Ubuntu in my HP Pavilion dv6745tx laptop. I cannot connect the Huawei E220 usb modem since 11.10 beta1 (now I'm in beta2). There is no problem in natty. I have found this in syslog Oct 5 07:10:51 ubuntu NetworkManager[1681]: <info> Activation (ttyUSB0) starting connection 'Dialog GSM Postpaid' Oct 5 07:10:51 ubuntu NetworkManager[1681]: <info> (ttyUSB0): device state change: disconnected -> prepare (reason 'none') [30 40 0] Oct 5 07:10:51 ubuntu NetworkManager[1681]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) scheduled... Oct 5 07:10:51 ubuntu NetworkManager[1681]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) started... Oct 5 07:10:51 ubuntu NetworkManager[1681]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) complete. Oct 5 07:10:58 ubuntu NetworkManager[1681]: <warn> GSM connection failed: (32) Sending command failed: 'Resource temporarily unavailable' Oct 5 07:10:58 ubuntu NetworkManager[1681]: <info> (ttyUSB0): device state change: prepare -> failed (reason 'unknown') [40 120 1] Oct 5 07:10:58 ubuntu NetworkManager[1681]: <warn> Activation (ttyUSB0) failed. Oct 5 07:10:58 ubuntu NetworkManager[1681]: <info> (ttyUSB0): device state change: failed -> disconnected (reason 'none') [120 30 0] Oct 5 07:10:58 ubuntu NetworkManager[1681]: <info> (ttyUSB0): deactivating device (reason: 0). Oct 5 07:10:58 ubuntu NetworkManager[1681]: nm_system_iface_flush_routes: assertion `ifindex > 0' failed Oct 5 07:10:58 ubuntu NetworkManager[1681]: nm_system_iface_flush_addresses: assertion `ifindex > 0' failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/868034/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp