Ubuntu22.04升级后，LTE Modem EM7455停止工作

Question

可能与调制解调器管理器-gui在Ubuntu 22.04更新后中断有关，但在这种情况下，我不使用modem-manager-gui，而是使用mmcli。

现在，经过一定的升级(大概15天前)，调制解调器一点也不活跃。

调制解调器被确认为：

mmcli -L
    /org/freedesktop/ModemManager1/Modem/0 [Sierra Wireless, Incorporated] Sierra Wireless EM7455 Qualcomm Snapdragon X7 LTE-A

SIM卡是活动的，有信用卡。甚至不可能启动USSD命令。

当使用旧的ISO (Lubuntu21.10)时，它的工作原理非常完美。

Answer 1

按照libqmi-utils的建议通过安装https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/1968581/comments/4解决问题

不在链接中，但我也重新启动了ModemManager服务。

现在只是modem-manager-gui，它与下面的输出中断了：

~ modem-manager-gui

(modem-manager-gui:6140): GLib-CRITICAL **: 00:07:51.363: g_strrstr: assertion 'haystack != NULL' failed
Connection manager: Network Manager >= 0.9.0
Modem manager: Modem Manager >= 0.7.0

(modem-manager-gui:6140): GLib-CRITICAL **: 00:07:52.063: g_strrstr: assertion 'haystack != NULL' failed

(modem-manager-gui:6140): GLib-CRITICAL **: 00:07:52.103: g_variant_lookup_value: assertion 'g_variant_is_of_type (dictionary,
G_VARIANT_TYPE ("a{s*}")) || g_variant_is_of_type (dictionary, G_VARIANT_TYPE ("a{o*}"))' failed

(modem-manager-gui:6140): GLib-CRITICAL **: 00:07:52.103: g_variant_lookup_value: assertion 'g_variant_is_of_type (dictionary,
G_VARIANT_TYPE ("a{s*}")) || g_variant_is_of_type (dictionary, G_VARIANT_TYPE ("a{o*}"))' failed

(modem-manager-gui:6140): GLib-CRITICAL **: 00:07:52.103: g_variant_lookup_value: assertion 'g_variant_is_of_type (dictionary,
G_VARIANT_TYPE ("a{s*}")) || g_variant_is_of_type (dictionary, G_VARIANT_TYPE ("a{o*}"))' failed

(modem-manager-gui:6140): GLib-CRITICAL **: 00:07:52.103: g_variant_lookup_value: assertion 'g_variant_is_of_type (dictionary,
G_VARIANT_TYPE ("a{s*}")) || g_variant_is_of_type (dictionary, G_VARIANT_TYPE ("a{o*}"))' failed

(modem-manager-gui:6140): GLib-CRITICAL **: 00:07:52.103: g_variant_unref: assertion 'value != NULL' failed
Segmentation fault at address: 0x20
Stack trace:
1. /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_bit_lock+0x50) [0x7f8d75cd7540]
2. /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_bit_lock+0x50) [0x7f8d75cd7540]
3. /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_variant_n_children+0x1d) [0x7f8d75d5137d]
4. /usr/lib/x86_64-linux-gnu/modem-manager-gui/modules/libmodcm_nm09.so(+0x3bc0) [0x7f8d70077bc0]
5. modem-manager-gui(mmguicore_connections_enum+0x6d) [0x55d2f3383d4d]
6. modem-manager-gui(+0x4a520) [0x55d2f33a4520]
7. modem-manager-gui(mmguicore_devices_open+0x1c0) [0x55d2f3388f90]
8. modem-manager-gui(+0x414fe) [0x55d2f339b4fe]
9. modem-manager-gui(+0x4a7a2) [0x55d2f33a47a2]

但是我可以用mmcli来处理。

Answer 2

这就是解决办法：

ln -sft /etc/ModemManager/fcc-unlock.d /usr/share/ModemManager/fcc-unlock.available.d/*

Answer 3

在最新版本的ModemManager中，自动FCC解锁被禁用。您可以在这里看到：https://modemmanager.org/docs/modemmanager/fcc-unlock/要再次使用调制解调器，您必须FCC解锁调制解调器。

联想出品的EM7455：

sudo ln /usr/share/ModemManager/fcc-unlock.available.d/1199:9079 /etc/ModemManager/fcc-unlock.d -sft