1st case: cannot use the modem, even cannot see in devices list etc.: modem-manager.connection-lost.log
2nd case: I pull out the modem and plug back after some seconds, it get known, tried to connect but dropped the connection immediately. modem-manager.connection-lost_new_plug.log
3rd case: reboot, working well.
The attached messages.log contains the end of the 2nd case and a normal operation (boot, activated, everything working well at this moment).
In fact, I have no idea, what is going on and why these things happen. I did not see any segfault. Even, last night it was working all the night, but in the morning I had several issues.
Hi,
I found this Q&A:
http://askubuntu.com/questions/66470/persistent-3g-connection-with-network-manager-fails
We try to force the 2G connection instead of 3G and try to use the persist option for pppd.
Could somebody confirm this option? I mean, does anybody use it successfully to keep the connection alive "forever"?
Thanks,
István