TP-LINK TL-WN722N无法连接17.04

我有这个TP-LINK TL-WN722N用于ubuntu的早期版本。17.04是全新安装，并且不保留Wifi连接。

我可以单击“连接”，它会尝试连接，但是随后我收到一条消息，说无线断开了。

sudo modprobe ath9k_htc 什么都不返回

$ iwconfig
bnep0     no wireless extensions.

wlx10feed20305c  IEEE 802.11  ESSID:off/any
          Mode:Managed  Access Point: Not-Associated   Tx-Power=20 dBm
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off

eno1      no wireless extensions.

lo        no wireless extensions.

$ lsusb
Bus 002 Device 005: ID 0b05:179c ASUSTek Computer, Inc.
Bus 002 Device 004: ID 0781:5567 SanDisk Corp. Cruzer Blade
Bus 002 Device 003: ID 177f:0250 Sweex
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 004: ID 046d:c05b Logitech, Inc. M-U0004 810-001317 [B110 Optical USB Mouse]
Bus 005 Device 003: ID 413c:2010 Dell Computer Corp. Keyboard
Bus 005 Device 002: ID 413c:1003 Dell Computer Corp. Keyboard Hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 0bda:0136 Realtek Semiconductor Corp.
Bus 001 Device 005: ID 0cf3:9271 Atheros Communications, Inc. AR9271 802.11n
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


$ dmesg |  grep -e wlan -e ath9k
[    8.492093] usb 1-1.1: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested
[    8.492104] usbcore: registered new interface driver ath9k_htc
[    8.781521] usb 1-1.1: ath9k_htc: Transferred FW: ath9k_htc/htc_9271-1.4.0.fw, size: 51008
[    9.033804] ath9k_htc 1-1.1:1.0: ath9k_htc: HTC initialized with 33 credits
[    9.303670] ath9k_htc 1-1.1:1.0: ath9k_htc: FW Version: 1.4
[    9.303672] ath9k_htc 1-1.1:1.0: FW RMW support: On
[    9.313272] ath9k_htc 1-1.1:1.0 wlx10feed20305c: renamed from wlan0
[  873.694860] usb 1-1.1: ath9k_htc: USB layer deinitialized
[ 1163.949779] usb 1-1.1: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested
[ 1164.236649] usb 1-1.1: ath9k_htc: Transferred FW: ath9k_htc/htc_9271-1.4.0.fw, size: 51008
[ 1164.488920] ath9k_htc 1-1.1:1.0: ath9k_htc: HTC initialized with 33 credits
[ 1164.757511] ath9k_htc 1-1.1:1.0: ath9k_htc: FW Version: 1.4
[ 1164.757514] ath9k_htc 1-1.1:1.0: FW RMW support: On
[ 1164.769568] ath9k_htc 1-1.1:1.0 wlx10feed20305c: renamed from wlan0

[更新]

$ dpkg -l network-manager
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                                         Version                     Architecture                Description
+++-============================================-===========================-===========================-==============================================================================================
ii  network-manager                              1.4.4-1ubuntu3              amd64                       network management framework (daemon and userspace tools)

[/更新]

从16.10更新到17.04时，我遇到了类似的问题。通过将以下行添加到/etc/NetworkManager/NetworkManager.conf然后重新启动计算机，解决了该问题。

[device]    
wifi.scan-rand-mac-address=0

从16.10升级到17.04后，我遇到了类似的问题。这很可能是因为您的设备的MAC地址被自动随机分配了。您可以通过使用ifconfig命令检查MAC地址来验证（如果您记得原始地址）。

怎么修：

将以下行添加到/etc/NetworkManager/NetworkManager.conf：

[device]
...
wifi.scan-rand-mac-address=0

现在保存文件并使用以下命令重新启动网络管理器：

sudo systemctl restart network-manager

现在重启。