problem with huawei e355 with xubuntu 14.04 and modemmanager 1.0.0

[som]

hi,
i am using xubuntu 14.04 with modemmanager 1.0.0 version and i am having a problem with huawei E355 modem [1]. in (x)ubuntu 12.04.3, and 13.04 , this device used to work by default; just a plug and play device. both of them used to have linux 3.8 kernel series.

huawei E355 is a device with 1xethernet-over-usb connection and 5xwifi connection creator. 


ideally, after plugging the device into a desktop/laptop, the network manager applet should show two connections- one under the "wired connection" heading and the other under the "wireless connection" heading. both (x)ubuntu 12.04.3 and 13.04 performed as expected.

unfortunately, that is not happening with post 3.8 kernel series; ie, (x)ubuntu 13.10 onwards. only the "wireless connection" option is visible; but not the "wired connection" part. ethernet-over-usb is not working- neither in xubuntu 13.10 nor in in 14.04, LTS.


possible reason: cdc_ncm part of the kernel was changed beyond 3.8 series but the changes were  not represented in the modem manager. 


reasons for thinking so: 

in a german user forum[2], it was suggested first. they recompiled the 3.11 kernel and deactivated the changes made in cdc_ncm after 3.8 kernel series. and, suddenly the "wired connection" option is visible again in xubuntu 13.10. 

unfortunately, this is not a permanent solution; and anyway its not working in xubuntu 14.04 LTS. how to solve this problem permanently and in the LTS version in particular?

any help will really be appreciated.

links:
[1] -> http://www.huaweidevice.co.in/Products/MobileBroadband/E355.php
[2] -> http://forum.ubuntuusers.de/topic/huawei-e355-als-kabelnetzwerk-einbinden-wwan0-/
launchpad bug: https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/1309054


regards,

som
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