Debugging modem detection in ModemManager

Mon Jan 15 18:02:03 UTC 2018

Hi,

Thanks, I found the documentation
https://www.freedesktop.org/software/ModemManager/api/latest/ref-overview-modem-detection-and-setup.html

And it turns out that ID_MM_CANDIDATE is not set:

# udevadm info -q all --name cdc-wdm0
P:
/devices/soc/6a00000.ssusb/6a00000.dwc3/xhci-hcd.0.auto/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.8/usbmisc/cdc-wdm0
N: cdc-wdm0
E: DEVNAME=/dev/cdc-wdm0
E:
DEVPATH=/devices/soc/6a00000.ssusb/6a00000.dwc3/xhci-hcd.0.auto/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.8/usbmisc/cdc-wdm0
E: MAJOR=180
E: MINOR=176
E: SUBSYSTEM=usbmisc

Debugging the udev rules now, the file
/lib/udev/rules.d/80-mm-candidate.rules does exist and looks correct.

Thanks,
Kelvin,

On 15 January 2018 at 16:59, Aleksander Morgado <aleksander at aleksander.es>
wrote:

> Hey Kelvin,
>
> >
> > Is there a way to debug ModemManager's detection of a modem?
> >
> > I have built a kernel with support for the Telit LE910, enabling
> > CONFIG_USB_SERIAL_OPTION and CONFIG_USB_NET_QMI_WWAN. The expected five
> > /dev/ttyUSBx and one /dev/cdc-wdm0 devices are present. But when I run
> > "mmcli -L" it says "No modems were found".
> >
> > qmicli can talk to the modem:
> > qmicli -d /dev/cdc-wdm0 --dms-get-model
> > [/dev/cdc-wdm0] Device model retrieved:
> > Model: 'LE910-EUG'
> >
> > I get some 'OK' responses if I send 'AT\r' to the modem ports
> (/dev/ttyUSB2
> > and /dev/ttyUSB3).
> >
> > But ModemManager itself doesn't find any modem. Is there a way to debug
> > ModemManager's detection process, or is there a common reason for MM
> > ignoring a QMI device?
> >
> > Here is some debug from startup:
> >
> > systemctl stop ModemManager
> > ModemManager --debug
> >
> > ModemManager[1185]: <info> [1516028939.541822] [main.c:158] main():
> > ModemManager (version 1.6.4) starting in system bus...
> > ModemManager[1185]: <debug> [1516028939.544058] [mm-sleep-monitor.c:245]
> > mm_sleep_monitor_get(): create MMSleepMonitor singleton (0x5581b4c090)
> > ModemManager[1185]: <debug> [1516028939.549882] [main.c:83]
> > bus_acquired_cb(): Bus acquired, creating manager...
> > ModemManager[1185]: <debug> [1516028939.560090]
> [mm-plugin-manager.c:1559]
> > load_plugins(): [plugin manager] looking for plugins in
> > '/usr/lib/aarch64-linux-gnu/ModemManager'
> > ModemManager[1185]: <debug> [1516028939.561938]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Altair LTE'
> > ModemManager[1185]: <debug> [1516028939.562617]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'AnyDATA'
> > ModemManager[1185]: <debug> [1516028939.563342]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Cinterion'
> > ModemManager[1185]: <debug> [1516028939.564068]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Dell'
> > ModemManager[1185]: <debug> [1516028939.564791]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Ericsson MBM'
> > ModemManager[1185]: <debug> [1516028939.565393]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Generic'
> > ModemManager[1185]: <debug> [1516028939.565949]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Haier'
> > ModemManager[1185]: <debug> [1516028939.567707]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Huawei'
> > ModemManager[1185]: <debug> [1516028939.568443]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Iridium'
> > ModemManager[1185]: <debug> [1516028939.569484]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Linktop'
> > ModemManager[1185]: <debug> [1516028939.570380]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Longcheer'
> > ModemManager[1185]: <debug> [1516028939.571210]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Motorola'
> > ModemManager[1185]: <debug> [1516028939.572093]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'MTK'
> > ModemManager[1185]: <debug> [1516028939.573238]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Nokia (Icera)'
> > ModemManager[1185]: <debug> [1516028939.573974]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Nokia'
> > ModemManager[1185]: <debug> [1516028939.575158]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Novatel'
> > ModemManager[1185]: <debug> [1516028939.576484]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Novatel LTE'
> > ModemManager[1185]: <debug> [1516028939.577341]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Option High-Speed'
> > ModemManager[1185]: <debug> [1516028939.577875]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Option'
> > ModemManager[1185]: <debug> [1516028939.578295]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Pantech'
> > ModemManager[1185]: <debug> [1516028939.578800]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Samsung'
> > ModemManager[1185]: <debug> [1516028939.579329]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Sierra (legacy)'
> > ModemManager[1185]: <debug> [1516028939.579787]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Sierra'
> > ModemManager[1185]: <debug> [1516028939.580234]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'SimTech'
> > ModemManager[1185]: <debug> [1516028939.580776]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Telit'
> > ModemManager[1185]: <debug> [1516028939.581260]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Thuraya'
> > ModemManager[1185]: <debug> [1516028939.581694]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Via CBP7'
> > ModemManager[1185]: <debug> [1516028939.582138]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'Wavecom'
> > ModemManager[1185]: <debug> [1516028939.582630]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'X22X'
> > ModemManager[1185]: <debug> [1516028939.583142]
> [mm-plugin-manager.c:1584]
> > load_plugins(): [plugin manager] loaded plugin 'ZTE'
> > ModemManager[1185]: <debug> [1516028939.583298]
> [mm-plugin-manager.c:1609]
> > load_plugins(): [plugin manager] successfully loaded 30 plugins
> > ModemManager[1185]: <debug> [1516028939.585506] [main.c:105]
> > name_acquired_cb(): Service name 'org.freedesktop.ModemManager1' was
> > acquired
> > ModemManager[1185]: <debug> [1516028939.585722] [mm-base-manager.c:498]
> > mm_base_manager_start(): Starting automatic device scan...
> > ModemManager[1185]: <debug> [1516028939.661558] [mm-base-manager.c:537]
> > mm_base_manager_start(): Finished device scan...
> > ModemManager[1185]: <debug> [1516028939.661860] [mm-sleep-monitor.c:108]
> > take_inhibitor(): [sleep-monitor] taking systemd sleep inhibitor
> > ModemManager[1185]: <debug> [1516028939.679752] [mm-sleep-monitor.c:97]
> > inhibit_done(): [sleep-monitor] inhibitor fd is 10
> >
> >
> > I've included some detailed USB info below.
> >
> > I also briefly tried a Sierra MC7403 which also created some /dev/ttyUSBx
> > devices and a pair of /dev/cdc-wdm devices, but MM didn't make use of
> that
> > modem either. It's a bit like QMI mode is not enabled in MM?
> >
> > Any hints much appreciated.
> >
>
> Is the udev daemon running in the system? E.g. to notify of device
> additions in realtime.
>
> --
> Aleksander
> https://aleksander.es
>
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