Ericsson F5521gw 3G module for Lenovo not using optimal kernel module

[Marius B. Kotsbak]

Binary package hint: modemmanager

The Ericsson F5521gw 3G module should use the usb_ncm kernel module (/dev/usb0) for connecting for optimal speed and CPU usage (important for HSPA+ connections). Modemmanager needs to be told this for the usb ID 0bdb:1911 (currently only 0bdb:190d supported).

See the attached patch already in current version of modemmanager:

http://cgit.freedesktop.org/ModemManager/ModemManager/commit/?id=0b757465ffe6108066d32312ab4e895c372c8f72

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: modemmanager 0.4+git.20110124t203624.00b6cce-2ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-9.43-generic-pae 2.6.38.4
Uname: Linux 2.6.38-9-generic-pae i686
Architecture: i386
Date: Fri Jun 3 12:41:25 2011
ProcEnviron:
 LANGUAGE=nb_NO:nb:no_NO:no:nn_NO:nn:en
 PATH=(custom, user)
 LANG=nb_NO.UTF-8
 SHELL=/bin/bash
SourcePackage: modemmanager
UpgradeStatus: Upgraded to natty on 2011-04-29 (35 days ago)

[Stefan Metzmacher (metze)]

I had the same problem and the patch fixed it for me

[Marius B. Kotsbak (mariusko)]

Fix released in upstream modemmanager >=0.4.996.

[Mathieu Trudel-Lapierre (cyphermox)]

Indeed, this has been in Oneiric for a few weeks now; closing as Fix Released.

[Marius B. Kotsbak (mariusko)]

It should be backported to the LTS.

[Mathieu Trudel-Lapierre (cyphermox)]

Marius, does applying just that udev change make the modem work in Lucid? No point in getting this backported if there are other commits in MM 0.5 required to make this work properly.

[Marius B. Kotsbak (mariusko)]

Yes it should, as long as the kernel has the usb_ncm module.

[Marius B. Kotsbak (mariusko)]

I verified that usb_ncm is available in the 2.6.38 kernel for Lucid: http://packages.ubuntu.com/lucid-updates/i386/linux-image-2.6.38-10-generic/filelist

I also see that /usr/lib/ModemManager/libmm-plugin-mbm.so, which the udev rule trigger, is present:

http://packages.ubuntu.com/lucid-updates/i386/modemmanager/filelist