M.2 XMM7360 (L850) on 5.19.1: "SIM not inserted"

As it seems like there is kernel support (thanks to https://github.com/torvalds/linux/commit/1f52d7b622854b8bd7a1be3de095ca2e1f77098e) for this WWAN card, I would like to use it with Modem Manager 😄

Previously I was using it with https://github.com/xmm7360/xmm7360-pci

Kernel: 5.19.1-051901-generic MM: 1.18.10-1 Lenovo X1 Carbon Gen6

Logs:

Aug 15 10:08:47 blacky ModemManager[1638]: <info>  [device /sys/devices/pci0000:00/0000:00:1c.2/0000:03:00.0] creating modem with plugin 'generic' and '3' ports
Aug 15 10:08:47 blacky ModemManager[1638]: <warn>  [plugin/generic] could not grab port wwan0at0: Cannot add port 'wwan/wwan0at0', unhandled port type
Aug 15 10:08:47 blacky ModemManager[1638]: <info>  [base-manager] modem for device '/sys/devices/pci0000:00/0000:00:1c.2/0000:03:00.0' successfully created
Aug 15 10:08:47 blacky ModemManager[1638]: <warn>  [modem0] couldn't load supported IP families: SIM not inserted
Aug 15 10:08:47 blacky ModemManager[1638]: <info>  [modem0] state changed (unknown -> locked)
Aug 15 10:08:47 blacky ModemManager[1638]: <warn>  [modem0] modem couldn't be initialized: Couldn't check unlock status: SIM not inserted
Aug 15 10:08:47 blacky ModemManager[1638]: <info>  [modem0] state changed (locked -> failed)
Aug 15 10:08:47 blacky NetworkManager[1570]: <info>  [1660550927.8372] manager: (wwan0at1): new Broadband device (/org/freedesktop/NetworkManager/Devices/6)
Aug 15 10:08:47 blacky NetworkManager[1570]: <info>  [1660550927.8374] device (wwan0at1): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
Aug 15 10:08:47 blacky NetworkManager[1570]: <info>  [1660550927.8376] device (wwan0at1): modem state 'failed'
Aug 15 10:08:47 blacky NetworkManager[1570]: <info>  [1660550927.8377] modem-broadband[wwan0at1]: failed to retrieve SIM object: No SIM object available

Config:

root@blacky:~# mmcli -L
    /org/freedesktop/ModemManager1/Modem/0 [Fibocom] L850 LTE Module","L850
root@blacky:~# mmcli -m 0
  -----------------------------
  General  |              path: /org/freedesktop/ModemManager1/Modem/0
           |         device id: 47ff9568ca7899a6c0f9a7fb7d130572abf1a05f
  -----------------------------
  Hardware |      manufacturer: Fibocom
           |             model: L850 LTE Module","L850
           | firmware revision: 18500.5001.00.05.27.16
           |         supported: gsm-umts, lte
           |           current: gsm-umts, lte
           |      equipment id: 015184006627272
  -----------------------------
  System   |            device: /sys/devices/pci0000:00/0000:00:1c.2/0000:03:00.0
           |           drivers: iosm
           |            plugin: generic
           |      primary port: wwan0at1
           |             ports: wwan0 (net), wwan0at1 (at)
  -----------------------------
  Status   |             state: failed
           |     failed reason: sim-missing
           |       power state: on
  -----------------------------
  Modes    |         supported: allowed: 3g, 4g; preferred: none
           |           current: allowed: any; preferred: none

I have fcc lock disabled permanently by introducing commands (from https://github.com/xmm7360/xmm7360-usb-modeswitch#fcc-lock):

at@nvm:fix_cat_fcclock.fcclock_mode=0
at@store_nvm(fix_cat_fcclock)

and to confirm it:

AT+CFUN?

+CFUN: 1,0

OK

The SIM doesn't have PIN enabled, on windows works like a charm. So the SIM card is present and proved working 😄

I'm not the only one with the issue, there are more people there: https://github.com/xmm7360/xmm7360-pci/issues/31 but this issue tracker seems like more appropriate place.