Comment 17 for bug 458334

Issue happened to occur to me for a mobile broadband modem which is connected through USB to my Sony Vaio Laptop. This is though not always the behaviour and most often is as described in https://bugs.launchpad.net/ubuntu/+bug/477679 . The cause seems to be though the same.

However, workaround presented here is not applicable for a broadband mobile modem.

Notice: The system have been completely updated at 13th of November, so I don't know if the committed fix really have fixed the issue.