[Pkg-utopia-maintainers] Bug#824981: network-manager: Can not connect broadband using Sierra Wireless EM7455

[Gulfstream Wang]

Package: network-manager
Version: 1.2.2-1
Severity: important


After I complete a new mobile broadband connection, the dialog for input mobile broadband password is showed (see the attachment file).The "Connect" button can not be pressed unless anything is filled in the dialog.
But my provider is not need any username and password.

If I edit the configuration file in /etc/NetworkManager/system-connections, delete the username and password. Then connect, the connection can not be established, and I get an error message in daemon.log.

The error message is like blew.

 (NetworkManager:902): NetworkManager-wwan-CRITICAL **: modem_prepare_result: assertion 'state == NM_DEVICE_STATE_PREPARE' failed


My laptop is Thinkpad X1 carbon 4th Gen with Debian testing, the mobile broadband slot is embed.

Thanks to everyone!


-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.5.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=zh_CN.UTF-8, LC_CTYPE=zh_CN.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages network-manager depends on:
ii  adduser                3.114
ii  dbus                   1.10.8-1
ii  init-system-helpers    1.33
ii  isc-dhcp-client        4.3.4-1
ii  libaudit1              1:2.5.2-1
ii  libbluetooth3          5.36-1+b1
ii  libc6                  2.22-7
ii  libglib2.0-0           2.48.1-1
ii  libgnutls30            3.4.11-4
ii  libgudev-1.0-0         230-3
ii  libmm-glib0            1.4.14-1
ii  libndp0                1.6-1
ii  libnewt0.52            0.52.18-3
ii  libnl-3-200            3.2.27-1
ii  libnm0                 1.2.2-1
ii  libpam-systemd         229-5
ii  libpolkit-agent-1-0    0.105-15
ii  libpolkit-gobject-1-0  0.105-15
ii  libreadline6           6.3-8+b4
ii  libselinux1            2.5-2
ii  libsoup2.4-1           2.54.1-1
ii  libsystemd0            229-5
ii  libteamdctl0           1.24-1
ii  libuuid1               2.28-5
ii  lsb-base               9.20160110
ii  policykit-1            0.105-15
ii  udev                   229-5
ii  wpasupplicant          2.3-2.3

Versions of packages network-manager recommends:
ii  crda            3.13-1+b1
ii  dnsmasq-base    2.75-1
ii  iptables        1.6.0-2
ii  iputils-arping  3:20150815-2
ii  modemmanager    1.4.14-1
ii  ppp             2.4.7-1+2

Versions of packages network-manager suggests:
pn  libteam-utils  <none>

-- Configuration Files:
/etc/NetworkManager/NetworkManager.conf changed:
[main]
plugins=ifupdown,keyfile
[ifupdown]
managed=true


-- no debconf information