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Thread: Device 'Hewlett-Packard lt4120 Snapdragon X5 LTE'

  1. #1
    Join Date
    Sep 2015
    Location
    Northwest UK
    Beans
    152
    Distro
    Lubuntu 20.04 Focal Fossa

    Device 'Hewlett-Packard lt4120 Snapdragon X5 LTE'

    I suspect my HP lt4120 wireless broadband card isn't working because of kernel issues. It doesn't like kernels equal to or above 5.9.14

    I've identified and ordered a Sierra Wireless EM7345 card which hopefully *should* work with my kernel.

    In the event this solution still doesn't work, could I ask if someone who is running Ubuntu (or a derivative) 21.04, or 21.10 with a Linux kernel equal to or above 5.9.14, and who has a working PCI Express M.2 75-pin Module, WWAN / mobile broadband card in their device, (mainly laptops and tablets I should think), let me know what card they've got so I can try and Ebay something that will work on my laptop and kernel.

    I'll post back when the Sierra card comes, if it does or doesn't work.

    Thanks!
    Last edited by nginmu; December 13th, 2021 at 10:30 PM.
    I like the dollar uptime thing

  2. #2
    Join Date
    Sep 2015
    Location
    Northwest UK
    Beans
    152
    Distro
    Lubuntu 20.04 Focal Fossa

    Re: Device 'Hewlett-Packard lt4120 Snapdragon X5 LTE'

    Sierra Wireless EM7345 card rejected by HP Elitebook 850 G3's BIOS: "unsupported WWAN card has been disabled".

    HP list just one alternative card for this machine, but it's only 3G.

    So it looks like I'm stuck with the HP LT4120 card.

    but no matter - solution found:

    https://bugs.launchpad.net/ubuntu/+s...r/+bug/1574582

    The key part that fixed it for me is in reply #12:

    Update 2:
    You can also correct the fault in qmi based old modem udev script by replacing line:
    ATTR{bConfigurationValue}="1"
    with
    RUN+="/usr/sbin/usb_modeswitch -v 03f0 -p 9d1d --configuration 1"
    and it works without qmi errors.
    The direct write to attribute in udev script started to brake functionality from kernel 5.1x
    It now works.
    Last edited by nginmu; December 17th, 2021 at 03:59 AM.
    I like the dollar uptime thing

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