Hello I am experiencing periodic disconnections, once every hour or 2, while looking into kernel log it looks like mobile modem is periodically detached and re-attached to ttyUSB. Using only SIM1.
I am unsure these ttyUSB disconnections affect MODEM 1 (as it seems modem 1 is USB0 to 3). Is this a normal mechanism related to Modem 2 which is not supplied with a SIM ? Can you help looking what is going on and try understand if the disconnections are related to HW or network ?
This issue drops the online conference sessions randomly..
------- SYSTEM -----
HARDWARE REVISION0303
BATCH NUMBER0001
PRIMARY MODEM
MODELEG06
IMEI868759032103493
FW VERSIONEG06ELAR03A05M4G
SECONDARY MODEM
MODELEG06
IMEI868759032101307
FW VERSIONEG06ELAR04A04M4G
SYSTEM
FIRMWARE VERSIONRUTX_R_00.02.05.2
KERNEL VERSION4.14.171
-------- FROM KERNEL LOG -------
This is just an extract, I have more than 12 iterations in 48 hours runtime
[15194.315212] usb 3-1: USB disconnect, device number 2
[15194.315714] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[15194.319534] option 3-1:1.0: device disconnected
[15194.327708] option1 ttyUSB5: GSM modem (1-port) converter now disconnected from ttyUSB5
[15194.331769] option 3-1:1.1: device disconnected
[15194.340899] option1 ttyUSB6: GSM modem (1-port) converter now disconnected from ttyUSB6
[15194.344090] option 3-1:1.2: device disconnected
[15194.352571] option1 ttyUSB7: GSM modem (1-port) converter now disconnected from ttyUSB7
[15194.356690] option 3-1:1.3: device disconnected
[15194.449162] qmi_wwan 3-1:1.4 wwan1: unregister 'qmi_wwan' usb-xhci-hcd.1.auto-1, WWAN/QMI device
[15206.358874] usb 3-1: new high-speed USB device number 3 using xhci-hcd
[15206.573609] option 3-1:1.0: GSM modem (1-port) converter detected
[15206.573960] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB4
[15206.579588] option 3-1:1.1: GSM modem (1-port) converter detected
[15206.585788] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB5
[15206.592955] option 3-1:1.2: GSM modem (1-port) converter detected
[15206.598717] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB6
[15206.605179] option 3-1:1.3: GSM modem (1-port) converter detected
[15206.611659] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB7
[15206.637036] qmi_wwan 3-1:1.4: cdc-wdm1: USB WDM device
[15206.638814] qmi_wwan 3-1:1.4 wwan1: register 'qmi_wwan' at usb-xhci-hcd.1.auto-1, WWAN/QMI device, 72:84:4c:a2:20:0d
[25257.721590] usb 3-1: USB disconnect, device number 3
[25257.722108] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[25257.726017] option 3-1:1.0: device disconnected
[25257.734148] option1 ttyUSB5: GSM modem (1-port) converter now disconnected from ttyUSB5
[25257.738125] option 3-1:1.1: device disconnected
[25257.746937] option1 ttyUSB6: GSM modem (1-port) converter now disconnected from ttyUSB6
[25257.750609] option 3-1:1.2: device disconnected
[25257.758959] option1 ttyUSB7: GSM modem (1-port) converter now disconnected from ttyUSB7
[25257.763077] option 3-1:1.3: device disconnected
[25257.899511] qmi_wwan 3-1:1.4 wwan1: unregister 'qmi_wwan' usb-xhci-hcd.1.auto-1, WWAN/QMI device
[25269.798911] usb 3-1: new high-speed USB device number 4 using xhci-hcd
[25269.997562] option 3-1:1.0: GSM modem (1-port) converter detected
[25269.997886] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB4
[25270.003345] option 3-1:1.1: GSM modem (1-port) converter detected
[25270.009848] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB5
[25270.016667] option 3-1:1.2: GSM modem (1-port) converter detected
[25270.022728] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB6
[25270.029071] option 3-1:1.3: GSM modem (1-port) converter detected
[25270.035696] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB7
[25270.061107] qmi_wwan 3-1:1.4: cdc-wdm1: USB WDM device
[25270.062638] qmi_wwan 3-1:1.4 wwan1: register 'qmi_wwan' at usb-xhci-hcd.1.auto-1, WWAN/QMI device, 72:84:4c:a2:20:0d
