LTE Modem "Feather is Disabled"

  • Dev Team

    @scottesicdrone I'm leaning toward it being a hardware issue with your modem. Did anything hardware related change from when it was working and wasn't working? Do you have any other v1 modems you can test with?

  • Nothing physically changed that I can recall, and unfortunately, we don't have extra modems though we ordered more modems. Last potential useful bit of info: when I ran dmesg, I saw errors relating to qmi pop up but I don't know what to make of them:

    yocto:/# dmesg | grep "qmi"
    [    1.186410] usbcore: registered new interface driver qmi_wwan
    [    1.187419] msm_sharedmem: sharedmem_register_qmi: qmi init successful
    [    5.741357] sysmon_send_event_no_qmi: Message sending failed -19
    [    5.890086] type=1130 audit(7.556:61): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0-s15:c0.c1023 msg='unit=qmi_shutdown_modemd comm="systemd" exe="/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
    [    5.903844] sysmon_send_event_no_qmi: Message sending failed -19
    [    5.903850] sysmon_send_event_no_qmi: Message sending failed -19
    [    5.908564] sysmon-qmi: sysmon_clnt_svc_arrive: Connection established between QMI handle and slpi's SSCTL service
    [    5.914578] sysmon_send_event_no_qmi: Message sending failed -19
    [    6.039513] sysmon-qmi: sysmon_clnt_svc_arrive: Connection established between QMI handle and adsp's SSCTL service
    [    6.523379] sysmon-qmi: sysmon_clnt_svc_arrive: Connection established between QMI handle and modem's SSCTL service
    [    6.543970] msm_slim_qmi_send_power_request: QMI request failed 0x1 (Unknown error)
    [    7.045169] msm_slim_qmi_send_power_request: QMI request failed 0x1 (Unknown error)
    [    7.546548] msm_slim_qmi_send_power_request: QMI request failed 0x1 (Unknown error)
    [    8.049225] msm_slim_qmi_send_power_request: QMI request failed 0x1 (Unknown error)

  • Dev Team

    Can you also run voxl-version so I can see what system image / package version you're using.

  • Here is what I get when I run voxl-version:

    yocto:/# voxl-version
    system-image:    ModalAI 3.1.0 BUILDER: ekatzfey BUILD_TIME: 2020-12-23_19:41
    kernel:          #1 SMP PREEMPT Wed Dec 23 19:50:23 UTC 2020 3.18.71-perf
    factory-bundle:  1.0.1 (Yocto installation)
    architecture:    aarch64
    processor:       apq8096
    os:              GNU/Linux
    Package: voxl-suite
    Version: 0.3.4
    Depends: voxl-utils (>= 0.6.0), libmodal_json (>= 0.3.4), libmodal_pipe (>= 1.7.8), librc_math (>= 1.1.4), libvoxl_io (>= 0.5.4), mavlink-camera-manager (>= 0.0.1), opencv (>= 4.5.1), openmp (>= 10.0.1), voxl-camera-server (>= 0.5.6), voxl-dfs-server (>= 0.0.7), voxl-docker-support (>= 1.1.1), voxl-gphoto2 (>= 0.0.5), voxl-hal3-tof-cam-ros (>= 0.0.5), voxl-imu-server (>= 0.7.8), voxl-modem (>= 0.11.0), voxl-mpa-tflite-server (>= 0.0.2), voxl-mpa-tools (>= 0.1.6), voxl-nodes (>= 0.1.3), voxl-qvio-server (>= 0.2.1), voxl-rtsp (>= 1.0.3), voxl-streamer (>= 0.2.1), voxl-vision-px4 (>= 0.8.1), voxl-vpn (>= 0.0.3)
    Status: unknown ok not-installed
    Section: base
    Architecture: all
    MD5Sum: e1e5bf1a125affe5036099f6ce895bed
    Size: 1818
    Filename: voxl-suite_0.3.4.ipk
    Description: meta-package for voxl-suite stable release
    Package: voxl-suite
    Version: 0.2.0
    Depends: docker, imu_app (= 0.0.6), libvoxl_io (= 0.5.2), voxl-cam-manager (= 0.2.2), voxl-docker-support (= 1.1.1), voxl-hal3-tof-cam-ros (= 0.0.2), voxl-modem (= 0.10.0), voxl-nodes (= 0.0.8), voxl-rtsp (= 1.0.2), voxl-utils (= 0.5.2), voxl-vision-px4 (= 0.6.8), voxl_imu (= 0.0.4), voxl-time-sync (= 0.0.1), voxl-vpn (= 0.0.2), librc_math (= 1.1.2), libmodal_pipe (= 1.2.2), modalai-vl (= 0.1.3)
    Status: install user installed
    Section: base
    Architecture: armv7a
    MD5Sum: af706cd3c1ea59f274f2ed9b93141f1d
    Size: 870
    Filename: voxl-suite_0.2.0.ipk
    Description: meta-package to install all of the voxl-suite
    Installed-Time: 689

  • Dev Team

    Just to show you what a working modem would look like:

    / # voxl-modem --feather_configure
    Configuring GPIO pins
        Setting defaults:
            GPIO_PIN_WWAN_WAKEUP_IN  = 1
            GPIO_PIN_WWAN_POWER_ON_N = 1
            GPIO_PIN_WWAN_RESET_N    = 1
        feather is DISABLED
    ENABLE WNC feather module
        feather is DISABLED
        feather is DISABLED
        feather is DISABLED
        feather is ENABLED, device detected: /dev/ttyUSB0

    It comes up within a few seconds. Good thought about qmi / dmesg, those errors will go away once the modem is powered up correctly by voxl-modem

  • This makes a lot of sense. I have seen this working before but now it just says feather is DISABLED until it power cycles and repeats. So if I understand correctly, after a few seconds, /dev/ttyUSB0 will be created and then the feather is enabled? Also random question: what is a feather exactly? I haven't heard of this before and I tried to look into it but I'm still confused!

  • Dev Team

    @scottesicdrone Haha okay so "feather" is a remnant from the days that the VOXL predecessor was a Qualcomm product. The nickname for the project at the time was "Eagle", therefore a "feather" was the nickname for an add-on board for the Eagle. So any reference to "feather" in voxl-modem is just talking about the modem add-on board. An example of one of the VOXL's predecessors is currently powering NASA's "Ingenuity" Drone on Mars (

    A little ModalAI lore for you that you won't find on Google 😉

  • Love the Lore and good thing to note! Last last thing, here is the link to an instance of me running dmesg if that's of any use.
    output here
    I'm going to keep trying to figure this out because this is a time-sensitive situation but if we will know for sure if it's a hardware issue once we get another modem to test it on. Thanks for the help thus far! Anything else I should try on here?

  • Dev Team

    @scottesicdrone Thanks! I am going to have another resource take a look at the issue and I will update you with our conclusion. I will message you if anything else is needed.

  • Sounds good, thanks!

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