我的设备连接了两个调制解调器。当我扫描调制解调器并显示它们时，我只能找到其中一个。这是一份简短的报告：（我使用的是 Ubuntu 18.04 LTS，内核为 5.04）
admin@sintrones-abox:~$ lsusb
Bus 002 Device 002: ID 1e0e:901e Qualcomm / Option
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 04d8:0205 Microchip Technology, Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
admin@sintrones-abox:~$ lspci
00:00.0 Host bridge: Intel Corporation Device 9b43 (rev 05)
00:02.0 VGA compatible controller: Intel Corporation Device 9bc5 (rev 05)
00:12.0 Signal processing controller: Intel Corporation Device 06f9
00:14.0 USB controller: Intel Corporation Device 06ed
00:14.2 RAM memory: Intel Corporation Device 06ef
00:14.5 SD Host controller: Intel Corporation Device 06f5
00:16.0 Communication controller: Intel Corporation Device 06e0
00:16.3 Serial controller: Intel Corporation Device 06e3
00:17.0 SATA controller: Intel Corporation Device 06d2
00:1b.0 PCI bridge: Intel Corporation Device 06ac (rev f0)
00:1b.5 PCI bridge: Intel Corporation Device 06ad (rev f0)
00:1c.0 PCI bridge: Intel Corporation Device 06bd (rev f0)
00:1c.6 PCI bridge: Intel Corporation Device 06be (rev f0)
00:1c.7 PCI bridge: Intel Corporation Device 06bf (rev f0)
00:1d.0 PCI bridge: Intel Corporation Device 06b0 (rev f0)
00:1d.1 PCI bridge: Intel Corporation Device 06b1 (rev f0)
00:1d.6 PCI bridge: Intel Corporation Device 06b6 (rev f0)
00:1d.7 PCI bridge: Intel Corporation Device 06b7 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Device 0687
00:1f.3 Audio device: Intel Corporation Device 06c8
00:1f.4 SMBus: Intel Corporation Device 06a3
00:1f.5 Serial bus controller [0c80]: Intel Corporation Device 06a4
00:1f.6 Ethernet controller: Intel Corporation Device 0d4c
01:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
02:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
03:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
04:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
05:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
06:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
07:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
08:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
09:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
admin@sintrones-abox:~$ sudo mmcli -L
[sudo] password for admin:
/org/freedesktop/ModemManager1/Modem/0 [QCOM] SDXPRAIRIE-MTP _SN:1E3B9ABB
我真的不知道问题出在哪里...无论如何，我在编写 systemctl status ModemManager 时发现了一些奇怪的事情：
admin@sintrones-abox:~$ systemctl status ModemManager
● ModemManager.service - Modem Manager
Loaded: loaded (/lib/systemd/system/ModemManager.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2022-07-25 07:52:08 UTC; 58min ago
Main PID: 1622 (ModemManager)
Tasks: 5 (limit: 4915)
CGroup: /system.slice/ModemManager.service
├─1622 /usr/sbin/ModemManager --filter-policy=strict
└─2078 /usr/lib/libmbim/mbim-proxy
Jul 25 08:13:43 sintrones-abox ModemManager[1622]: <info> Couldn't check support for device '/sys/devices/p
Jul 25 08:13:43 sintrones-abox ModemManager[1622]: <info> Couldn't check support for device '/sys/devices/p
Jul 25 08:13:43 sintrones-abox ModemManager[1622]: <info> Couldn't check support for device '/sys/devices/p
Jul 25 08:13:43 sintrones-abox ModemManager[1622]: <info> Couldn't check support for device '/sys/devices/p
Jul 25 08:13:43 sintrones-abox ModemManager[1622]: <info> Couldn't check support for device '/sys/devices/p
Jul 25 08:13:43 sintrones-abox ModemManager[1622]: <info> Couldn't check support for device '/sys/devices/p
Jul 25 08:13:43 sintrones-abox ModemManager[1622]: <info> Couldn't check support for device '/sys/devices/p
Jul 25 08:14:06 sintrones-abox ModemManager[1622]: <info> [device /sys/devices/pci0000:00/0000:00:14.0/usb1
Jul 25 08:14:06 sintrones-abox ModemManager[1622]: <warn> Could not grab port (tty/ttyACM0): 'Cannot add po
Jul 25 08:14:06 sintrones-abox ModemManager[1622]: <warn> Couldn't create modem for device '/sys/devices/pc
如您所见，有两种类型的警告......
<warn> Could not grab port (tty/ttyACM0): 'Cannot add po
Jul 25 08:14:06 sintrones-abox ModemManager[1622]: <warn> Couldn't create modem for device '/sys/devices/pc
我该如何尝试解决这些问题？