I've run into this exact same issue with modemmanager 1.0.0-2ubuntu1 running Linux Mint 17.1. Downgraded to 0.5.2.0-0ubuntu2, and the modem works as specified and is stable.
** Attachment added: "log" https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/1390769/+attachment/4302021/+files/log -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to modemmanager in Ubuntu. https://bugs.launchpad.net/bugs/1390769 Title: modemmanager breaks Pantech UML295W Ubuntu 14.04 Status in modemmanager package in Ubuntu: Incomplete Bug description: Computer is a Asus 1215n. This verizon wireless air card worked great on Xubuntu 12.04, 12.10, 13.04 and 13.10. Broken when I upgraded to 14.04. I have posted a great deal of additional system diagnostic info in this thread http://ubuntuforums.org/showthread.php?t=2239564 The only BandAid that has worked so far is to regress modemmanager from 1.0.0-2ubuntu1 to 0.5.2.0-0ubuntu2. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: modemmanager 1.0.0-2ubuntu1 ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8 Uname: Linux 3.13.0-39-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.5 Architecture: amd64 Date: Sat Nov 8 12:17:48 2014 EcryptfsInUse: Yes ExecutablePath: /usr/sbin/ModemManager InstallationDate: Installed on 2014-01-22 (290 days ago) InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016) ProcEnviron: PATH=(custom, no user) TERM=linux SourcePackage: modemmanager UpgradeStatus: Upgraded to trusty on 2014-07-09 (121 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/1390769/+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
