mobile broadband connectie fail (timeout)

[rhhoek]

On Ubuntu 17.10 I cannot make a mobile broadband connection.
On my multiboot laptop with a Hewlett-Packard Gobi 2000 Wireless Modem I can successfully connect to T-Mobile broadband network when I use Ubuntu 17.04 (Gnome), but not with Ubuntu 17.10 (Artful Aardvark) with the latest patches applied.
The gobi-loader loads the firmware in both instances successfully ( the 3 ttyUSB ports are visible. I get a response on ttyUSB1 with an AT-command)

In the attached syslog you can see the connection times out.

Description: Ubuntu Artful Aardvark (development branch)
Release: 17.10

modemmanager:
  Installed: 1.6.8-1
  Candidate: 1.6.8-1
  Version table:
 *** 1.6.8-1 500
        500 http://nl.archive.ubuntu.com/ubuntu artful/main amd64 Packages
        100 /var/lib/dpkg/status

network-manager:
  Installed: 1.8.4-1ubuntu3
  Candidate: 1.8.4-1ubuntu3
  Version table:
 *** 1.8.4-1ubuntu3 500
        500 http://nl.archive.ubuntu.com/ubuntu artful/main amd64 Packages
        100 /var/lib/dpkg/status

[sugree (sugree)]

I got exactly the same problem since upgraded to artful. My modem is Huawei E176 (12d1:140c) and my workaround for now is to add file /etc/udev/rules.d/99-mm-e176.rules with below content to unset ID_MM_CANDIDATE on /dev/cdc-wdm*.

ACTION!="add|change|move", GOTO="mm_e176_end"

# E176
ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="140c", SUBSYSTEM=="usb", KERNEL=="cdc-wdm*", ENV{ID_MM_CANDIDATE}="0"
ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="140c", SUBSYSTEM=="usbmisc", KERNEL=="cdc-wdm*", ENV{ID_MM_CANDIDATE}="0"

LABEL="mm_e176_end"

[rhhoek (r-h-hoek)]

Thanks Sugree. Your workaround works for me too!

I added 99-mm-gobi.rules to /etc/udev/rules.d with this contents:

ACTION!="add|change|move", GOTO="mm_gobi_end"

# gobi
# Bus 001 Device 007: ID 03f0:251d Hewlett-Packard Gobi 2000 Wireless Modem
# unset ID_MM_CANDIDATE on /dev/cdc-wdm*.
# 2017-10-09 [Bug 1723210] Re: mobile broadband connectie fail (timeout)
ATTRS{idVendor}=="03f0", ATTRS{idProduct}=="251d", SUBSYSTEM=="usb", KERNEL=="cdc-wdm*", ENV{ID_MM_CANDIDATE}="0"
ATTRS{idVendor}=="03f0", ATTRS{idProduct}=="251d", SUBSYSTEM=="usbmisc", KERNEL=="cdc-wdm*", ENV{ID_MM_CANDIDATE}="0"

LABEL="mm_gobi_end"