How to use HP lt4132 mobile device on Linux

The HP lt4132 LTE/HSPA+ 4G Module comes with 3 different configurations;

  • USB configuration 1: QMI and TTY
  • USB configuration 2: ECM
  • USB configuration 3: MBIM

By default Linux kernel will use ECM(Ethernet Control Model)) configuration. This mode doesn’t work with NetworkManager.

Configuration 3 MBIM mode is more suitable to run drivers with NetworkManager. Changing configuration to MBIM mode is easy but first you need to deconfigure the device.

What: /sys/bus/usb/devices/.../bConfigurationValue
KernelVersion: since at least 2.6.18

Writing 0 or -1 to bConfigurationValue will reset the active configuration (unconfigure the device). Writing another value will change the active configuration. Note that some devices, in violation of the USB spec, have a
configuration with a value equal to 0. Writing 0 to bConfigurationValue for these devices will install that configuration, rather then unconfigure the device.

Step 1: Find your mobile modem device driver path

T: Bus=01 Lev=01 Prnt=01 Port=04 Cnt=02 Dev#= 3 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=ff MxPS=64 #Cfgs= 3
P: Vendor=03f0 ProdID=a31d Rev=01.02
S: Manufacturer=HP Inc.
S: Product=HP lt4132 LTE/HSPA+ 4G Module
S: SerialNumber=0123456789ABCDEF
C: #Ifs= 3 Cfg#= 3 Atr=a0 MxPwr=2mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=02(commc) Sub=0e Prot=00 Driver=cdc_mbim
I: If#= 1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=02 Driver=cdc_mbim
I: If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=06 Prot=14 Driver=(none)
#grep lt4132 /sys/bus/usb/devices/*/product
/sys/bus/usb/devices/1-5/product:HP lt4132 LTE/HSPA+ 4G Module

Step 2: Deconfigure and enable MBIM mode

# echo 0 > /sys/bus/usb/devices/1-5/bConfigurationValue
# sleep 1
# echo 3 > /sys/bus/usb/devices/1-5/bConfigurationValue
# mmcli -L
/org/freedesktop/ModemManager1/Modem/7 [Generic] MBIM [03F0:A31D]
# mmcli -m 7-e

Step 3: Define udev rules and restart the server

#cat /etc/udev/rules.d/hp_lt4132.rules
ACTION=="add|change", SUBSYSTEM=="usb", ATTR{idVendor}=="03f0", ATTR{idProduct}=="a31d", ATTR{bConfigurationValue}!="3", ATTR{bConfigurationValue}:="0"
ACTION=="add|change", SUBSYSTEM=="usb", ATTR{idVendor}=="03f0", ATTR{idProduct}=="a31d", ATTR{bConfigurationValue}!="3", RUN+="/bin/sh -c 'sleep 1; echo 3 > %S%p/bConfigurationValue'"
ACTION=="add|change", SUBSYSTEM=="net", ATTRS{idVendor}=="03f0", ATTRS{idProduct}=="a31d", ATTR{cdc_ncm/ndp_to_end}=="N", ATTR{cdc_ncm/ndp_to_end}:="Y"
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