Disregarding the time stamps, the first important different line between
the two logs is

modem-manager[4156]: <debug> [1356470691.972650] [mm-modem-base.c:155]
mm_modem_base_add_port(): (ttyUSB1) type primary claimed by
/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4

for qcserial.ko, where probing is requested by the "Gobi" plugin of
modem-manager according to the log.

With option.ko, the probing is requested by the "Huawei" plugin and it
looks as if the correct serial port (/dev/ttyUSB2) was queried, but
mm_modem_base_add_port() never gets called.

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https://bugs.launchpad.net/bugs/1079359

Title:
  3.2.0-32 drops Huawei EM680 (12d1:14f1) modem

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