@Aleksander Morgado:
This not a exact match of the problem, but some of the symptoms seems
the same, special the "It seems the kernel closes the USB port during
ModemManager's Huawei plugin probe, so it never gets fully connected and
probing loops forever" part.
In my case the HSUPA USB Modem is
Same problem here with 11.04 (Linux t410 2.6.38-8-generic #42-Ubuntu SMP
Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux)
Attached the modem-manager --debug output during the tests.
** Attachment added: "modem-manager --debug"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/7