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Sierra Wireless Mobile Broadband Network Adapter

Adapter / September 8, 2013

To get the card working, you have to switch the USB commication mode from MBMI to QMI mode! The ModemManager will apply the FCC-Auth command automatically, but this requires a QMI interface!

You can switch the mode by using or the prefered solution, by adding a special udev rule which also loads the required kernel modules. Additionally you have to install the qmi-utils:

apt-get install libqmi-utils.

This ruleset was modified to match Sierra E7455 modem. Add the following content to a new udev file, e.g. /etc/udev/rules.d/99-sierra.rules.

After adding these rules, you should reboot your system! Finally the Ubuntu Network-Manager should recognize the device!

And make sure to add a valid SIM-Card – otherwise the CDC Device will be recognized as “unavailable”.

ACTION!="add|change", GOTO="mbim_to_qmi_rules_end" SUBSYSTEM!="usb|drivers", GOTO="mbim_to_qmi_rules_end" # load qmi_wwan module SUBSYSTEM=="usb", \ ATTR{idVendor}=="1199", ATTR{idProduct}=="9079", \ RUN+="/sbin/modprobe -b qmi_wwan" # force Dell WWAN 5809e to configuration #1 SUBSYSTEM=="usb", \ ATTR{idVendor}=="1199", ATTR{idProduct}=="9079", \ ATTR{bConfigurationValue}="1" # add the new id in the qmi_wwan driver SUBSYSTEM=="drivers", \ ENV{DEVPATH}=="/bus/usb/drivers/qmi_wwan", \ ATTR{new_id}="1199 9079" # load qcserial module SUBSYSTEM=="usb", \ ATTR{idVendor}=="1199", ATTR{idProduct}=="9079", \ RUN+="/sbin/modprobe -b qcserial" # add the new id in the qcserial driver SUBSYSTEM=="drivers", \ ENV{DEVPATH}=="/bus/usb-serial/drivers/qcserial", \ ATTR{new_id}="1199 9079" LABEL="mbim_to_qmi_rules_end"

To verfiy that the udev rules are working, you can take a look on the “usb-devices” output, it should show qcserial and qmi_wwan as used drivers. If not, check the vendor and product ID in your ruleset!

# usb-devices T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 2 Spd=480 MxCh= 0 D: Ver= 2.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=1199 ProdID=9079 Rev=00.06 S: Manufacturer=Sierra Wireless, Incorporated S: Product=Sierra Wireless EM7455 Qualcomm Snapdragon X7 LTE-A S: SerialNumber=LF1013 C: #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=500mA I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=qcserial I: If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=qcserial I: If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=qcserial I: If#= 8 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan

Source: askubuntu.com