MC7355 on LINUX kernel 3.16.0-23-generic disconnects

IoT Modules MC/EM Series
1

We are using MC7355 on Panasonic toughbooks running Ubuntu 14.10 and kernel 3.16.0-23-generic. We have activated it with Verizon mobile service. When the machine first powers ups, the mobile networking connections works fine. But after a few hours, we see disconnects and only way we can establish the connection is after a reboot.

We do know the wireless connection to Verizon is fine.

Driver used is as below. Any pointers where we can look for issues?

modinfo qmi_wwan

filename: /lib/modules/3.16.0-23-generic/kernel/drivers/net/usb/qmi_wwan.ko
license: GPL
description: Qualcomm MSM Interface (QMI) WWAN driver
author: Bjørn Mork bjorn@mork.no
srcversion: BC051B8F143673336D7D5D8
alias: usb:v1410pA021ddcdscdpiciscipin00
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alias: usb:v05C6p9056ddcdscdpiciscipin03
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alias: usb:v05C6p9033ddcdscdpiciscipin05
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alias: usb:v05C6p902Eddcdscdpiciscipin05
alias: usb:v05C6p9026ddcdscdpiciscipin03
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alias: usb:v05C6p9022ddcdscdpiciscipin02
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alias: usb:v05C6p9011ddcdscdpiciscipin04
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alias: usb:v05C6p900Fddcdscdpiciscipin05
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alias: usb:v05C6p900Addcdscdpiciscipin04
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alias: usb:v05C6p7102ddcdscdpiciscipin03
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alias: usb:v05C6p7002ddcdscdpiciscipin01
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alias: usb:v0408pEA42ddcdscdpiciscipin04
alias: usb:v16D5p650Addcdscdpic02isc06ip00in*
alias: usb:v413Cp819Bddcdscdpic02isc06ip00in*
alias: usb:v413Cp8196ddcdscdpic02isc06ip00in*
alias: usb:v413Cp8195ddcdscdpic02isc06ip00in*
alias: usb:v1410p9011ddcdscdpic02isc06ip00in*
alias: usb:v1410p9010ddcdscdpic02isc06ip00in*
alias: usb:v1410pB001ddcdscdpic02isc06ip00in*
alias: usb:v106CpddcdscdpicFFiscF1ipFFin
alias: usb:v106CpddcdscdpicFFiscF0ipFFin
alias: usb:v12D1pddcdscdpicFFisc01ip67in
alias: usb:v12D1pddcdscdpicFFisc01ip37in
alias: usb:v12D1pddcdscdpicFFisc01ip11in
alias: usb:v12D1pddcdscdpicFFisc01ip07in
alias: usb:v12D1pddcdscdpicFFisc01ip69in
alias: usb:v12D1pddcdscdpicFFisc01ip39in
alias: usb:v12D1pddcdscdpicFFisc01ip09in
depends: usbnet,cdc-wdm
intree: Y
vermagic: 3.16.0-23-generic SMP mod_unload modversions 686
signer: Magrathea: Glacier signing key
sig_key: 61:C0:C7:65:8F:DB:5B:DE:6B:B6:E0:6E:F0:89:A8:B1:BF:B1:AE:32
sig_hashalgo: sha512

2

Hi,
which FW version are you using? Can you try with the latest FW version?

Also it is specific to this particular kernel??

Thanks,
Alex

3

Hi Alex,

I will try the new firmware as you mentioned. Currently this is only kernel I have tried MC7355. Will try other versions of kernels.

Thanks,
Jayesh

4

Trying other kernels is probably a waste of time unless the driver stops responding or crashes or something like that.

IIUC, the modem disconnects but continues to respond to QMI commands. Is that correct? What userspace tools do you use? The ModemManager + libqmi that came with Ubunutu? Look at the MM logs, and consider newer versions of MM and libqmi if you are running something really old.

But using the newest firmware is a good idea. That’s the most important part of the puzzle.