我最近购买了一台带有 Dell Wireless 5808 Gobi 4G LTE 调制解调器的 Dell XFR E6420。
它在 Windows 上运行良好，但在 Ubuntu 19.10 下根本无法连接。它被识别，但无法连接到网络。甚至根本找不到任何 GSM 网络。
输出mmcli --modem 0：
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General | dbus path: /org/freedesktop/ModemManager1/Modem/0
| device id: 9f3844ddd707503ae5d59d6334db353808513e0f
-----------------------------
Hardware | manufacturer: Sierra Wireless, Incorporated
| model: Dell Wireless 5808 Gobi™ 4G LTE Mobile Broadband Card
| firmware revision: SWI9X15C_05.05.42.00
| h/w revision: MC7355
| supported: gsm-umts, lte
| cdma-evdo, lte
| lte
| cdma-evdo, gsm-umts, lte
| current: cdma-evdo, gsm-umts, lte
| equipment id: 356195050941283
-----------------------------
System | device: /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.6
| drivers: cdc_mbim
| plugin: Dell
| primary port: cdc-wdm3
| ports: wwp0s29u1u6i12 (net), cdc-wdm3 (mbim)
-----------------------------
Numbers | own: 40729666376
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Status | unlock retries: sim-pin2 (3)
| state: searching
| power state: on
| signal quality: 0% (cached)
-----------------------------
Modes | supported: allowed: 2g; preferred: none
| allowed: 3g; preferred: none
| allowed: 2g, 3g; preferred: 3g
| allowed: 2g, 3g; preferred: 2g
| allowed: 2g, 4g; preferred: 4g
| allowed: 2g, 4g; preferred: 2g
| allowed: 3g, 4g; preferred: 3g
| allowed: 3g, 4g; preferred: 4g
| allowed: 2g, 3g, 4g; preferred: 4g
| allowed: 2g, 3g, 4g; preferred: 3g
| allowed: 2g, 3g, 4g; preferred: 2g
| current: allowed: 2g, 3g, 4g; preferred: 3g
-----------------------------
Bands | supported: egsm, dcs, pcs, g850, utran-1, utran-4, utran-5, utran-8,
| utran-2, eutran-2, eutran-4, eutran-5, eutran-13, eutran-17,
| eutran-25, cdma-bc0, cdma-bc1, cdma-bc10
| current: egsm, dcs, pcs, g850, utran-1, utran-4, utran-5, utran-8,
| utran-2, eutran-2, eutran-4, eutran-5, eutran-13, eutran-17,
| eutran-25, cdma-bc0, cdma-bc1, cdma-bc10
-----------------------------
IP | supported: ipv4, ipv6, ipv4v6
-----------------------------
3GPP | imei: 356195050941283
| enabled locks: fixed-dialing
| registration: searching
-----------------------------
SIM | dbus path: /org/freedesktop/ModemManager1/SIM/0
并mmcli -m 0 --simple-connect="apn=live.vodafone.ro"直接告诉我那件事error: couldn't connect the modem: 'Timeout was reached'。
我读到过这可能是固件错误？可能与调制解调器休眠有关，但我无论如何也想不出原因。