我的 4 台相同笔记本电脑中有 2 台的调制解调器连接出现问题。我在系统日志中发现这部分存在差异：
工作笔记本电脑
ModemManager[749]: <debug> [1563287931.952234] [filter] explicit whitelist: yes
ModemManager[749]: <debug> [1563287931.952240] [filter] virtual devices forbidden: yes
ModemManager[749]: <debug> [1563287931.952245] [filter] net devices allowed: yes
ModemManager[749]: <debug> [1563287931.952250] [filter] cdc-wdm devices allowed: yes
ModemManager[749]: <debug> [1563287931.952254] [filter] tty devices:
ModemManager[749]: <debug> [1563287931.952259] [filter] blacklist applied: no
ModemManager[749]: <debug> [1563287931.952264] [filter] manual scan only applied: no
ModemManager[749]: <debug> [1563287931.952268] [filter] platform driver check: yes
ModemManager[749]: <debug> [1563287931.952273] [filter] driver check: yes
ModemManager[749]: <debug> [1563287931.952277] [filter] cdc-acm interface check: yes
ModemManager[749]: <debug> [1563287931.952282] [filter] with net check: yes
ModemManager[749]: <debug> [1563287931.952286] [filter] default: forbidden
笔记本电脑不工作
ModemManager[749]: <debug> [1563287931.952234] [filter] explicit whitelist: yes
ModemManager[749]: <debug> [1563287931.952240] [filter] virtual devices forbidden: yes
ModemManager[749]: <debug> [1563287931.952245] [filter] net devices allowed: yes
ModemManager[749]: <debug> [1563287931.952250] [filter] cdc-wdm devices allowed: yes
ModemManager[749]: <debug> [1563287931.952254] [filter] tty devices:
ModemManager[749]: <debug> [1563287931.952259] [filter] blacklist applied: yes
ModemManager[749]: <debug> [1563287931.952264] [filter] manual scan only applied: yes
ModemManager[749]: <debug> [1563287931.952268] [filter] platform driver check: yes
ModemManager[749]: <debug> [1563287931.952273] [filter] driver check: no
ModemManager[749]: <debug> [1563287931.952277] [filter] cdc-acm interface check: no
ModemManager[749]: <debug> [1563287931.952282] [filter] with net check: no
ModemManager[749]: <debug> [1563287931.952286] [filter] default: allowed
我怀疑调制解调器所连接的端口不知何故被列入了黑名单(?) 我该如何检查呢？