> > >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-networ >k-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
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