[Pkg-utopia-maintainers] Bug#760618: network-manager 'forgets' about MC5725

[Matt Ventura]

Package: network-manager
Version: 0.9.10.0-1.1

When using a Sierra Wireless MC5725 wireless card with network-manager, when
the "Enable Mobile Broadband" option in the menu is disabled, n-m will rfkill
the card. The card will drop off the USB bus as expected. However, in the n-m
applet, the "Enable Mobile Broadband" option is now gone with no way to get
it back other than manually re-enabling the card with rfkill.

Syslog output, after disabling mobile broadband in nm:


Sep  5 20:06:57 x300 NetworkManager[1988]: <info> WWAN hardware radio set disabled
Sep  5 20:06:57 x300 NetworkManager[1988]: <info> (ttyUSB0): modem state changed, 'registered' --> 'disabling' (reason: user preference)
Sep  5 20:06:57 x300 NetworkManager[1988]: <info> (ttyUSB0): device state change: disconnected -> unavailable (reason 'modem-failed') [30 20 57]
Sep  5 20:06:57 x300 NetworkManager[1988]: <info> (ttyUSB0): deactivating device (reason 'modem-failed') [57]
Sep  5 20:06:57 x300 ModemManager[530]: <info>  Modem /org/freedesktop/ModemManager1/Modem/5: state changed (registered -> disabling)
Sep  5 20:06:57 x300 ModemManager[530]: <info>  Modem /org/freedesktop/ModemManager1/Modem/5: signal quality updated (0)
Sep  5 20:06:57 x300 ModemManager[530]: <info>  Modem /org/freedesktop/ModemManager1/Modem/5: access technology changed (evdoa -> unknown)
Sep  5 20:06:57 x300 ModemManager[530]: <info>  Modem /org/freedesktop/ModemManager1/Modem/5: state changed (disabling -> disabled)
Sep  5 20:06:57 x300 NetworkManager[1988]: <info> (ttyUSB0): modem state changed, 'disabling' --> 'disabled' (reason: user-requested)
Sep  5 20:06:57 x300 ModemManager[530]: <warn>  (ttyUSB0): port attributes not fully set
Sep  5 20:06:57 x300 NetworkManager[1988]: <info> WWAN now disabled by radio killswitch
Sep  5 20:06:57 x300 ModemManager[530]: Couldn't reload current power state: Serial port is now closed
Sep  5 20:06:57 x300 ModemManager[530]: <warn>  (ttyUSB0) could not open serial device (2)
Sep  5 20:06:57 x300 ModemManager[530]: mm_serial_port_close: assertion 'priv->open_count > 0' failed
Sep  5 20:06:57 x300 kernel: [ 4443.068122] usb 6-1: USB disconnect, device number 7
Sep  5 20:06:57 x300 kernel: [ 4443.068881] sierra ttyUSB0: resubmit read urb failed.(-19)
Sep  5 20:06:57 x300 kernel: [ 4443.072223] sierra ttyUSB0: Sierra USB modem converter now disconnected from ttyUSB0
Sep  5 20:06:57 x300 kernel: [ 4443.074505] sierra ttyUSB1: Sierra USB modem converter now disconnected from ttyUSB1
Sep  5 20:06:57 x300 kernel: [ 4443.075266] sierra ttyUSB2: Sierra USB modem converter now disconnected from ttyUSB2
Sep  5 20:06:57 x300 kernel: [ 4443.075298] sierra 6-1:1.0: device disconnected
Sep  5 20:06:57 x300 ModemManager[530]: <info>  (tty/ttyUSB0): released by modem /sys/devices/pci0000:00/0000:00:1d.1/usb6/6-1
Sep  5 20:06:57 x300 ModemManager[530]: <info>  (tty/ttyUSB2): released by modem /sys/devices/pci0000:00/0000:00:1d.1/usb6/6-1
Sep  5 20:06:57 x300 ModemManager[530]: <info>  (tty/ttyUSB1): released by modem /sys/devices/pci0000:00/0000:00:1d.1/usb6/6-1
Sep  5 20:06:57 x300 NetworkManager[1988]: <info> (ttyUSB0): device state change: unavailable -> unmanaged (reason 'removed') [20 10 36]


Either n-m needs to use a different method of sensing the presence
of the card such that it won't "forget" it's there after it
rfkills it, or it should not rfkill the card.

Other info
Debian version: unstable
modemmanager version: 1.2.0-1
uname -a: Linux x300 3.14.13-x300 #2 SMP Sun Aug 3 21:45:26 PDT 2014 x86_64 GNU/Linux
(I can test this bug with a stock kernel if someone believes
the custom kernel may have something to do with this).