%20WWAN%20LTE%20%E8%B0%83%E5%88%B6%E8%A7%A3%E8%B0%83%E5%99%A8%E6%80%A7%E8%83%BD%E7%BC%93%E6%85%A2.png)
亲爱的 Ubuntu 社区，
我唯一的操作系统是 Ubuntu 18.04 LTS（事实上，它是 XUbuntu 18.04）。
最近，我将 DW5804 (E371) PCI-E LTE 调制解调器卡安装到我的笔记本电脑（顺便说一下，是戴尔 Latitude E6420）中。
事实证明，调制解调器似乎只在 GPRS 模式下工作 - 好像没有更高的速度模式可用。我的 gkrellm 图表显示调制解调器接口的峰值速度高达 15-17 KBps。
有趣的是，一旦我插入 XUbuntu 安装 USB 棒并从中重新启动机器并运行 XUbuntu 演示而不是安装向导，我的调制解调器的运行速度就会快得多。不确定这是否是 LTE 速度，但我可以轻松观看一些 YouTube 视频。Gkrellm 在调制解调器界面上显示 500+ KBps。
我可以在网络管理器/调制解调器设置中更改哪些内容以使其在 LTE 速度下工作？
说实话，我甚至不知道应该粘贴什么输出来帮助你解决我的问题。让我从我的基本操作系统的 usb-devices 输出开始：
T: Bus=02 Lev=02 Prnt=02 Port=05 Cnt=02 Dev#= 4 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=413c ProdID=819b Rev=00.00
S: Manufacturer=Novatel Wireless, Inc.
S: Product=Novatel Wireless HSPA
S: SerialNumber=012773000360251
C: #Ifs= 7 Cfg#= 1 Atr=e0 MxPwr=500mA
I: If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I: If#= 1 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I: If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I: If#= 3 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I: If#= 4 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I: If#= 6 Alt= 0 #EPs= 1 Cls=02(commc) Sub=06 Prot=00 Driver=qmi_wwan
I: If#= 7 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=qmi_wwan
mmcli -m 0 显示以下内容：
--------------------------------
General | dbus path: /org/freedesktop/ModemManager1/Modem/0
| device id: 8e91d2a924c045cb128290c57cbe91349ac23264
--------------------------------
Hardware | manufacturer: Novatel Wireless Incorporated
| model: 4051
| revision: MDM9200-3.32 1 [2011-12-16 10:00:07]
| h/w revision: 203F1000
| supported: gsm-umts, lte
| current: gsm-umts, lte
| equipment id: 012773000360253
--------------------------------
System | device: /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.6
| drivers: option1, qmi_wwan
| plugin: Dell
| primary port: cdc-wdm1
| ports: ttyUSB0 (at), ttyUSB1 (qcdm), ttyUSB2 (qcdm), ttyUSB3 (at),
| cdc-wdm1 (qmi), wwp0s29u1u6i6 (net)
--------------------------------
Status | lock: sim-pin2
| unlock retries: sim-pin (3), sim-pin2 (3), sim-puk (10), sim-puk2 (10)
| state: disabled
| power state: low
| signal quality: 0% (cached)
--------------------------------
Modes | supported: allowed: 2g; preferred: none
| allowed: 3g; preferred: none
| allowed: 4g; 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: none
--------------------------------
Bands | supported: egsm, dcs, pcs, g850, utran-1, utran-4, utran-6, utran-5,
| utran-2
| current: egsm, dcs, pcs, g850, utran-1, utran-5, utran-2
--------------------------------
IP | supported: ipv4, ipv6, ipv4v6
--------------------------------
3GPP | imei: 012773000360253
| enabled locks: sim
--------------------------------
3GPP EPS | ue mode of operation: ps-1
--------------------------------
SIM | dbus path: /org/freedesktop/ModemManager1/SIM/0
--------------------------------
Bearer | dbus path: /org/freedesktop/ModemManager1/Bearer/0
请帮忙。