我在 16.04 LTS 中使用 MC7403 调制解调器。调制解调器管理器“mmcli -m 0”返回的信号质量为 0，网络管理器也是如此，我该如何让信号强度正确更新？
初始连接后，它是正确的，但 30 秒后它返回 0。与 ISP 和互联网的连接仍然有效，但我无法再监控信号强度。
看来 modemmanger 开始查看 /dev/ttyUSB0 而不是 /dev/ttyUSB2 30 秒后，网络管理器日志中也出现此错误
IPV6CP: 发送配置请求超时
日志显示了这个错误。
Dec 22 13:38:05 roamescar-pc ModemManager[16197]: <debug> [1482377885.290585] [mm-iface-modem.c:1165] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (0)
Dec 22 13:38:35 roamescar-pc ModemManager[16197]: <debug> [1482377915.290986] [mm-broadband-modem.c:1991] modem_load_signal_quality(): loading signal quality...
Dec 22 13:38:35 roamescar-pc ModemManager[16197]: <debug> [1482377915.291145] [mm-iface-modem.c:934] access_technologies_check_ready(): Couldn't refresh access technologies: 'No AT port available to run command'
Dec 22 13:38:35 roamescar-pc ModemManager[16197]: <debug> [1482377915.291233] [mm-port-serial-qcdm.c:201] debug_log(): (ttyUSB0): --> 4
我打开了调试并创建了日志。这是截断的，如果有帮助的话我可以粘贴整个日志
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7183] platform-linux: do-add-ip4-route[13: 32.97.0.0/32 700]: success
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7189] device[0x1c96c10] (ttyUSB2): set IP4Config instance (/org/freedesktop/NetworkManager/IP4Config/10)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7190] default-route: entry[0/dev:0x1c96c10:ttyUSB2:1:+sync]: record:add 0.0.0.0/0 via 32.97.0.0 dev 13 metric 700 mss 0 src user (700)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7190] default-route: entry[0/dev:0x1c96c10:ttyUSB2:1:+sync]: sync:add 0.0.0.0/0 via 32.97.0.0 dev 13 metric 700 mss 0 src user (700)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7190] platform: route: adding or updating IPv4 route: 0.0.0.0/0 via 32.97.0.0 dev 13 metric 700 mss 0 src user
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7201] platform: signal: route 4 added: 0.0.0.0/0 via 32.97.0.0 dev 13 metric 700 mss 0 src user scope global
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7202] platform-linux: do-add-ip4-route[13: 0.0.0.0/0 700]: success
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7203] dns-mgr: (device_ip4_config_changed): queueing DNS updates (1)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7203] dns-mgr: (device_ip4_config_changed): DNS configuration did not change
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7203] dns-mgr: (device_ip4_config_changed): no DNS changes to commit (0)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7204] device[0x1c96c10] (ttyUSB2): activation-stage: schedule activate_stage5_ip4_config_commit,2 (id 302)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7209] device[0x1c96c10] (ttyUSB2): activation-stage: invoke activate_stage5_ip4_config_commit,2 (id 302)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7211] platform: address: adding or updating IPv4 address: 10.92.16.64/32 lft forever pref forever lifetime 3-0[4294967295,4294967295] ptp 32.97.0.0 dev 13 src unknown
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7215] platform-linux: do-add-ip4-address[13: 10.92.16.64/32,32.97.0.0]: success
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7215] route-mgr4: 13: sync 1 IPv4 routes
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7216] platform: route: adding or updating IPv4 route: 32.97.0.0/32 via 0.0.0.0 dev 13 metric 700 mss 0 src kernel pref-src 10.92.16.64
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7217] platform-linux: do-add-ip4-route[13: 32.97.0.0/32 700]: success
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7218] device[0x1c96c10] (ttyUSB2): remove_pending_action (1): 'dhcp4' not pending (expected)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <info> [1482377855.7218] device (ttyUSB2): state change: ip-config -> ip-check (reason 'none') [70 80 0]
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7221] firewall: [0x7ff4ec00fa10,change*:"ppp0"]: firewall zone change ppp0:default (not running, simulate success)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7226] device[0x1c96c10] (ttyUSB2): activation-stage: complete activate_stage5_ip4_config_commit,2 (id 302)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7243] default-route: entry[0/dev:0x1c96c10:ttyUSB2:1:-sync]: record:update 0.0.0.0/0 via 32.97.0.0 dev 13 metric 700 mss 0 src user scope global (700)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7245] firewall: [0x7ff4ec00fa10,change*:"ppp0"]: complete: fake success
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7246] device[0x1c96c10] (ttyUSB2): add_pending_action (2): 'queued state change to secondaries'
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7249] device[0x1c96c10] (ttyUSB2): queued state change to secondaries due to none (id 307)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7250] device[0x1c96c10] (ttyUSB2): running queued state change to secondaries (id 307)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <info> [1482377855.7250] device (ttyUSB2): state change: ip-check -> secondaries (reason 'none') [80 90 0]
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7252] device[0x1c96c10] (ttyUSB2): add_pending_action (3): 'queued state change to activated'
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7253] device[0x1c96c10] (ttyUSB2): queued state change to activated due to none (id 310)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7253] manager: ActivatingConnection now (none)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7254] device[0x1c96c10] (ttyUSB2): device entered SECONDARIES state
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7254] device[0x1c96c10] (ttyUSB2): remove_pending_action (2): 'queued state change to secondaries'
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7258] device[0x1c96c10] (ttyUSB2): running queued state change to activated (id 310)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <info> [1482377855.7259] device (ttyUSB2): state change: secondaries -> activated (reason 'none') [90 100 0]
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7261] active-connection[0x1bc3130]: set state activated (was activating)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7267] connectivity: set online
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7267] connectivity: state changed from NONE to FULL
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7267] manager: connectivity checking indicates FULL
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <info> [1482377855.7271] manager: NetworkManager state is now CONNECTED_LOCAL
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7274] active-connection[0x1bc3130]: check-master-ready: not signalling (state activated, no master)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7339] device[0x1c96c10] (ttyUSB2): remove_pending_action (1): 'activation::0x1bc3130'
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7346] dns-mgr: (device_state_changed): queueing DNS updates (1)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7347] dns-mgr: (update_routing_and_dns): queueing DNS updates (2)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <info> [1482377855.7348] manager: NetworkManager state is now CONNECTED_GLOBAL
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <info> [1482377855.7352] policy: set 'Telstra Telstra (Next G) 1' (ppp0) as default for IPv4 routing and DNS
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7352] manager: PrimaryConnection now Telstra Telstra (Next G) 1
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7354] dns-mgr: (update_routing_and_dns): DNS configuration changed
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7354] dns-mgr: (update_routing_and_dns): no DNS changes to commit (1)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7355] dns-mgr: (device_state_changed): DNS configuration changed
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7355] dns-mgr: (device_state_changed): committing DNS changes (0)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7355] dns-mgr: update-dns: updating resolv.conf
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7356] dns-mgr: update-dns: updating plugin dnsmasq
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7360] kill process 'dnsmasq' (2432): waiting up to 1000 milliseconds for process to disappear after sending SIGKILL (9)...
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7527] kill process 'dnsmasq' (2432): process is gone after sending signal SIGKILL (9) (16766 usec elapsed)
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <info> [1482377855.7528] dns-plugin[0x1bbcf40]: starting dnsmasq...
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7529] dns-plugin[0x1bbcf40]: command line: /usr/sbin/dnsmasq --no-resolv --keep-in-foreground --no-hosts --bind-interfaces --pid-file=/var/run/NetworkManager/dnsmasq.pid --listen-address=127.0.1.1 --cache-size=0 --conf-file=/dev/null --proxy-dnssec --enable-dbus=org.freedesktop.NetworkManager.dnsmasq --conf-dir=/etc/NetworkManager/dnsmasq.d
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7543] dns-plugin[0x1bbcf40]: dnsmasq started with pid 16306
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7557] dnsmasq[0x1bbcf40]: adding nameserver '10.5.133.45'
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7559] dnsmasq[0x1bbcf40]: adding nameserver '10.5.136.242'
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7560] dnsmasq[0x1bbcf40]: dnsmasq not found on the bus. The nameserver update will be sent when dnsmasq appears
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <info> [1482377855.7560] dns-mgr: Writing DNS information to /sbin/resolvconf
Dec 22 13:37:35 roamescar-pc dnsmasq[16306]: started, version 2.75 cache disabled
Dec 22 13:37:35 roamescar-pc dnsmasq[16306]: compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth DNSSEC loop-detect inotify
Dec 22 13:37:35 roamescar-pc dnsmasq[16306]: DBus support enabled: connected to system bus
Dec 22 13:37:35 roamescar-pc dnsmasq[16306]: warning: no upstream servers configured
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <info> [1482377855.7689] device (ttyUSB2): Activation: successful, device activated.
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7690] device[0x1c96c10] (ttyUSB2): set metered value 3
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7691] manager: new metered value: 3
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7692] device[0x1c96c10] (ttyUSB2): remove_pending_action (0): 'queued state change to activated'
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7692] manager: check_if_startup_complete returns FALSE because of enp1s0
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7750] dnsmasq[0x1bbcf40]: dnsmasq proxy creation successful
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <info> [1482377855.7872] dnsmasq[0x1bbcf40]: dnsmasq appeared as :1.156
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7873] dnsmasq[0x1bbcf40]: trying to update dnsmasq nameservers
Dec 22 13:37:35 roamescar-pc whoopsie[892]: [13:37:35] The default IPv4 route is: /org/freedesktop/NetworkManager/ActiveConnection/0
Dec 22 13:37:35 roamescar-pc dnsmasq[16306]: setting upstream servers from DBus
Dec 22 13:37:35 roamescar-pc dnsmasq[16306]: using nameserver 10.5.133.45#53
Dec 22 13:37:35 roamescar-pc dnsmasq[16306]: using nameserver 10.5.136.242#53
Dec 22 13:37:35 roamescar-pc NetworkManager[16259]: <debug> [1482377855.7894] dnsmasq[0x1bbcf40]: dnsmasq update successful
Dec 22 13:37:35 roamescar-pc whoopsie[892]: [13:37:35] Network connection may be a paid data plan: /org/freedesktop/NetworkManager/Devices/5
Dec 22 13:37:35 roamescar-pc pppd[16275]: Script /etc/ppp/ip-up finished (pid 16286), status = 0x0
Dec 22 13:37:36 roamescar-pc gnome-session[1543]: (deja-dup-monitor:3722): GLib-CRITICAL **: Source ID 229 was not found when attempting to remove it
Dec 22 13:37:38 roamescar-pc pppd[16275]: sent [IPV6CP ConfReq id=0x1 <addr fe80::b44b:b091:d684:2148>]
Dec 22 13:37:39 roamescar-pc NetworkManager[16259]: <debug> [1482377859.2669] device[0x1c1e890] (enp1s0): remove_pending_action (0): 'carrier wait'
Dec 22 13:37:39 roamescar-pc NetworkManager[16259]: <debug> [1482377859.2671] manager: check_if_startup_complete returns FALSE because of enp4s0
Dec 22 13:37:39 roamescar-pc NetworkManager[16259]: <debug> [1482377859.2672] device[0x1c41100] (enp4s0): remove_pending_action (0): 'carrier wait'
Dec 22 13:37:39 roamescar-pc NetworkManager[16259]: <debug> [1482377859.2672] manager: check_if_startup_complete returns FALSE because of enp3s0
Dec 22 13:37:39 roamescar-pc NetworkManager[16259]: <debug> [1482377859.2673] device[0x1c54cb0] (enp3s0): remove_pending_action (0): 'carrier wait'
Dec 22 13:37:39 roamescar-pc NetworkManager[16259]: <debug> [1482377859.2674] manager: check_if_startup_complete returns FALSE because of enp2s0
Dec 22 13:37:39 roamescar-pc NetworkManager[16259]: <debug> [1482377859.2674] device[0x1c62060] (enp2s0): remove_pending_action (0): 'carrier wait'
Dec 22 13:37:39 roamescar-pc NetworkManager[16259]: <info> [1482377859.2675] manager: startup complete
Dec 22 13:37:41 roamescar-pc pppd[16275]: sent [IPV6CP ConfReq id=0x1 <addr fe80::b44b:b091:d684:2148>]
Dec 22 13:37:43 roamescar-pc NetworkManager[16259]: <info> [1482377863.2652] WiFi hardware radio set enabled
Dec 22 13:37:43 roamescar-pc NetworkManager[16259]: <info> [1482377863.2654] WWAN hardware radio set enabled
Dec 22 13:37:44 roamescar-pc pppd[16275]: sent [IPV6CP ConfReq id=0x1 <addr fe80::b44b:b091:d684:2148>]
Dec 22 13:38:02 roamescar-pc pppd[16275]: message repeated 6 times: [ sent [IPV6CP ConfReq id=0x1 <addr fe80::b44b:b091:d684:2148>]]
Dec 22 13:38:05 roamescar-pc pppd[16275]: IPV6CP: timeout sending Config-Requests
Dec 22 13:38:05 roamescar-pc ModemManager[16197]: <debug> [1482377885.286966] [mm-broadband-modem.c:1991] modem_load_signal_quality(): loading signal quality...
Dec 22 13:38:05 roamescar-pc ModemManager[16197]: <debug> [1482377885.287108] [mm-iface-modem.c:934] access_technologies_check_ready(): Couldn't refresh access technologies: 'No AT port available to run command'
Dec 22 13:38:05 roamescar-pc ModemManager[16197]: <debug> [1482377885.287186] [mm-port-serial-qcdm.c:201] debug_log(): (ttyUSB0): --> 40 7c b2 7e
Dec 22 13:38:05 roamescar-pc ModemManager[16197]: <debug> [1482377885.290141] [mm-port-serial-qcdm.c:201] debug_log(): (ttyUSB0): <-- 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 de ad 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7d 5e d7 7e
Dec 22 13:38:05 roamescar-pc ModemManager[16197]: <debug> [1482377885.290585] [mm-iface-modem.c:1165] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (0)
Dec 22 13:38:35 roamescar-pc ModemManager[16197]: <debug> [1482377915.290986] [mm-broadband-modem.c:1991] modem_load_signal_quality(): loading signal quality...
Dec 22 13:38:35 roamescar-pc ModemManager[16197]: <debug> [1482377915.291145] [mm-iface-modem.c:934] access_technologies_check_ready(): Couldn't refresh access technologies: 'No AT port available to run command'
Dec 22 13:38:35 roamescar-pc ModemManager[16197]: <debug> [1482377915.291233] [mm-port-serial-qcdm.c:201] debug_log(): (ttyUSB0): --> 40 7c b2 7e
Dec 22 13:38:35 roamescar-pc ModemManager[16197]: <debug> [1482377915.292423] [mm-port-serial-qcdm.c:201] debug_log(): (ttyUSB0): <-- 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 de ad 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7d 5e d7 7e
Dec 22 13:38:35 roamescar-pc ModemManager[16197]: <debug> [1482377915.292730] [mm-iface-modem.c:1165] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (0)
Dec 22 13:39:05 roamescar-pc ModemManager[16197]: <debug> [1482377945.266642] [mm-broadband-modem.c:1991] modem_load_signal_quality(): loading signal quality...
Dec 22 13:39:05 roamescar-pc ModemManager[16197]: <debug> [1482377945.266742] [mm-iface-modem.c:934] access_technologies_check_ready(): Couldn't refresh access technologies: 'No AT port available to run command'
Dec 22 13:39:05 roamescar-pc ModemManager[16197]: <debug> [1482377945.266774] [mm-port-serial-qcdm.c:201] debug_log(): (ttyUSB0): --> 40 7c b2 7e
Dec 22 13:39:05 roamescar-pc ModemManager[16197]: <debug> [1482377945.269222] [mm-port-serial-qcdm.c:201] debug_log(): (ttyUSB0): <-- 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 de ad 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7d 5e d7 7e
Dec 22 13:39:05 roamescar-pc ModemManager[16197]: <debug> [1482377945.269486] [mm-iface-modem.c:1165] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (0)
Dec 22 13:39:35 roamescar-pc ModemManager[16197]: <debug> [1482377975.268692] [mm-broadband-modem.c:1991] modem_load_signal_quality(): loading signal quality...
Dec 22 13:39:35 roamescar-pc ModemManager[16197]: <debug> [1482377975.268952] [mm-iface-modem.c:934] access_technologies_check_ready(): Couldn't refresh access technologies: 'No AT port available to run command'
Dec 22 13:39:35 roamescar-pc ModemManager[16197]: <debug> [1482377975.269132] [mm-port-serial-qcdm.c:201] debug_log(): (ttyUSB0): --> 40 7c b2 7e
Dec 22 13:39:35 roamescar-pc ModemManager[16197]: <debug> [1482377975.272297] [mm-port-serial-qcdm.c:201] debug_log(): (ttyUSB0): <-- 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 de ad 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7d 5e d7 7e
Dec 22 13:39:35 roamescar-pc ModemManager[16197]: <debug> [1482377975.272660] [mm-iface-modem.c:1165] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (0)
答案1
简而言之，16.04.1 LTS 内核 4.4.* 不够新，无法正确支持 qmi 接口。您需要升级内核或使用 Ubuntu 16.10 或更新版本。此外，modemmanger 可能需要升级。我使用 Aleksander 提供的 PPA 使其在 16.04 LTS 中短期内运行。
长答案我能够使用此方法收集上述日志调试。
我应一位 libmbim 开发人员的要求收集了新日志。从中他可以看到如上所示，它使用 AT+PPP。Aleksander 建议我需要一个新的内核和 modemmanager 来尝试这个。
关于调制解调器的一些说明。使用 AT!USBCOMP？我能够看到这些调制解调器没有为 mbim 仅 qmi 配置。我确实在 16.04 LTS 中尝试了 mbim，但它仍然不起作用，需要更新的内核和调制解调器管理器。
报告信号强度可能不会让您担心，但至少就我而言，不使用正确的接口也会限制您的速度。
使用 AT+PPP 运行时，我的下载速度为 35Mbps，上传速度为 18 Mbps。使用 LTE 接口时，我的下载速度为 35-45 Mps，上传速度为 23-29 Mbps