This is not an usb_modeswitch problem, it is a usb core or hub driver problem. It causes a device connect/disconnect/connect/disconnect loop not only for the 3G modem but also for the Samsung Android device:
[ 7387.580579] usb 2-3: USB disconnect, device number 6 [ 7387.860066] usb 2-3: new high-speed USB device number 7 using ehci-pci [ 7387.993516] usb 2-3: New USB device found, idVendor=04e8, idProduct=6860 [ 7387.993524] usb 2-3: New USB device strings: Mfr=2, Product=3, SerialNumber=4 . . . [14103.048295] usb 2-3: USB disconnect, device number 13 [14106.560123] usb 2-4: new high-speed USB device number 14 using ehci-pci [14106.693349] usb 2-4: New USB device found, idVendor=04e8, idProduct=6860 [14106.693356] usb 2-4: New USB device strings: Mfr=2, Product=3, SerialNumber=4 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1330076 Title: USB modem cannot be used if removed then reattached To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/usb-modeswitch/+bug/1330076/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs