>From looking at the source code, we have a udev test and a HAL test.
The udev path looks for ID_NM_MODEM_GSM=1 in the capabilities.
On my system, my Sierra device has:
$ sudo /sbin/udevadm info --query=env
--path=/sys/devices/pci0000:00/0000:00:1e.0/0000:03:01.0/0000:04:00.0/usb8/8-1/8-1:1.0
UDEV_LOG=3
DEVPATH=/devices/pci0000:00/0000:00:1e.0/0000:03:01.0/0000:04:00.0/usb8/8-1/8-1:1.0
DEVTYPE=usb_interface
DRIVER=sierra
DEVICE=/proc/bus/usb/008/002
PRODUCT=1199/6820/2
TYPE=0/0/0
INTERFACE=255/255/255
MODALIAS=usb:v1199p6820d0002dc00dsc00dp00icFFiscFFipFF
So no GSM string.
But in the HAL path, it looks for 'GSM-07.07' in modem.command_sets,
which my system does have:
$ sudo lshal
[...]
udi =
'/org/freedesktop/Hal/devices/usb_device_1199_6820_noserial_if0_serial_usb_0'
access_control.file = '/dev/ttyUSB0' (string)
access_control.type = 'modem' (string)
info.callouts.add = {'hal-acl-tool --add-device'} (string list)
info.callouts.remove = {'hal-acl-tool --remove-device'} (string list)
info.capabilities = {'serial', 'modem', 'access_control'} (string list)
info.category = 'serial' (string)
info.parent =
'/org/freedesktop/Hal/devices/usb_device_1199_6820_noserial_if0' (string)
info.product = 'AC875 Device' (string)
info.subsystem = 'tty' (string)
info.udi =
'/org/freedesktop/Hal/devices/usb_device_1199_6820_noserial_if0_serial_usb_0'
(string)
linux.device_file = '/dev/ttyUSB0' (string)
linux.hotplug_type = 2 (0x2) (int)
linux.subsystem = 'tty' (string)
linux.sysfs_path =
'/sys/devices/pci0000:00/0000:00:1e.0/0000:03:01.0/0000:04:00.0/usb8/8-1/8-1:1.0/ttyUSB0/tty/ttyUSB0'
(string)
modem.command_sets = {'GSM-07.07', 'GSM-07.05'} (string list)
serial.device = '/dev/ttyUSB0' (string)
serial.originating_device =
'/org/freedesktop/Hal/devices/usb_device_1199_6820_noserial_if0' (string)
serial.port = 0 (0x0) (int)
serial.type = 'usb' (string)
[...]
Then the code says we trust udev over HAL...
/* Case (c): HAL thinks it's a modem, but udev doesn't */
nm_info ("(%s): ignoring due to lack of probed mobile broadband
capabilties", ttyname);
later = FALSE;
So I've got to make udev return that extra capability, which is
obviously what Alexander's patches are about, but at least know I know
why and how I might be able to help.
--
Network-Manager not seeing broadband card
https://bugs.launchpad.net/bugs/360905
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