<div style="font-family: Arial; font-size: 14px;">Hello all,<br><br>I am working with an mPCI Telit LE910C4 modem connected to a Linux System on a Chip running Ubunut 20.04. <br><br>With 1.18 ModemManager installed I noticed that serial ports were being listed as ignored except for a GPS port was available through a tty, this meant I couldnt issue AT commands. I also needed bit error rate from the mmlib-glib API so I decided to build ModemManager 1,21.<br><br>Upon upgrading the modem no longer recognizes as a qmi device, but the AT command tty terminals are available. I was hoping for some advice on how to investigate this behavior. I did not build libqmi from source because whenever I try to compile on the device compilation freezes (overnight) on compiling certain *.o files. However, I am able to get the modem connected. <br><br>Any advice on how to debug why the modem is no longer being recognized as a qmi device?<br>I am wondering if I need to change the USB configuration of the modem,but this seems likee it would be strange, as it was interacting with the modem via qmi previously via cdc_wdm0.<br><br>Below I will post output from mmcli from version 1.21 with QMI not working. <br><br><br>Thanks,</div><div style="font-family: Arial; font-size: 14px;">Rick<br><br><span>  --------------------------------</span><div><span>  General  |                 path: /org/freedesktop/ModemManager1/Modem/0</span></div><div><span>           |            device id: <br></span></div><div><span>  --------------------------------</span></div><div><span>  Hardware |         manufacturer: Telit</span></div><div><span>           |                model: LE910C4-NF</span></div><div><span>           |    firmware revision: 25.21.660-P0F.661806</span></div><div><span>           |            supported: gsm-umts, lte</span></div><div><span>           |              current: gsm-umts, lte</span></div><div><span>           |         equipment id: <br></span></div><div><span>  --------------------------------</span></div><div><span>  System   |               device: /sys/devices/platform/soc@0/32c00000.bus/32e50000.usb/ci_hdrc.1/usb1/1-1/1-1.2</span></div><div><span>           |              drivers: option, qmi_wwan</span></div><div><span>           |               plugin: telit</span></div><div><span>           |         primary port: ttyUSB2</span></div><div><span>           |                ports: ttyUSB0 (ignored), ttyUSB1 (gps), ttyUSB2 (at),</span></div><div><span>           |                       ttyUSB3 (at), ttyUSB4 (ignored), wwan0 (ignored)</span></div><div><span>  --------------------------------</span></div><div><span>  Status   |       unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (10), sim-puk2 (10)</span></div><div><span>           |                state: connected</span></div><div><span>           |          power state: on</span></div><div><span>           |          access tech: lte</span></div><div><span>           |       signal quality: 85% (recent)</span></div><div><span>  --------------------------------</span></div><div><span>  Modes    |            supported: allowed: 2g; preferred: none</span></div><div><span>           |                       allowed: 3g; preferred: none</span></div><div><span>           |                       allowed: 2g, 3g; preferred: none</span></div><div><span>           |                       allowed: 4g; preferred: none</span></div><div><span>           |                       allowed: 2g, 4g; preferred: none</span></div><div><span>           |                       allowed: 3g, 4g; preferred: none</span></div><div><span>           |                       allowed: 2g, 3g, 4g; preferred: none</span></div><div><span>           |              current: allowed: 3g, 4g; preferred: none</span></div><div><span>  --------------------------------</span></div><div><span>  IP       |            supported: ipv4, ipv6, ipv4v6</span></div><div><span>  --------------------------------</span></div><div><span>  3GPP     |                 imei: <br></span></div><div><span>           |          operator id: 310410</span></div><div><span>           |        operator name: AT&T</span></div><div><span>           |         registration: roaming</span></div><div><span>           | packet service state: attached</span></div><div><span>  --------------------------------</span></div><div><span>  3GPP EPS | ue mode of operation: csps-2</span></div><div><span>  --------------------------------</span></div><div><span>  SIM      |     primary sim path: /org/freedesktop/ModemManager1/SIM/0</span></div><div><span>  --------------------------------</span></div><span>  Bearer   |                paths: /org/freedesktop/ModemManager1/Bearer/0</span><br><br></div><div style="font-family: Arial; font-size: 14px;"><br></div>
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