在 Realtek RTL8723AE 上 WiFi 始终掉线

Question

我有 ubuntu 14.04，但是，这个问题也存在于我的 13.04 安装中。

当我在大学通过 Wi-Fi 使用我的笔记本电脑时，连接经常丢失。在家里使用我的 Wi-Fi 网络时，连接永远不会掉线。

我所知道的连接之间的唯一区别是大学使用代理和自动代理配置脚本。

我可以采取任何步骤来诊断问题并修复它吗？

description: Wireless interface
       product: RTL8723AE PCIe Wireless Network Adapter
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:04:00.0
       logical name: wlan0
       version: 00
       serial: 20:16:d8:d4:14:cf
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rtl8723ae driverversion=3.13.0-24-generic firmware=N/A ip=10.0.0.8 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
       resources: irq:18 ioport:d000(size=256) memory:f7900000-f7903fff  

编辑：这是我的互联网断开后的日志文件。

May 19 09:23:58 Jethro-Laptop kernel: [  407.463513] wlan0: associate with cc:d5:39:d1:95:90 (try 1/3)
May 19 09:23:58 Jethro-Laptop NetworkManager[767]: <info> (wlan0): supplicant interface state: authenticating -> associating
May 19 09:23:58 Jethro-Laptop wpa_supplicant[4100]: wlan0: Associated with cc:d5:39:d1:95:90
May 19 09:23:58 Jethro-Laptop kernel: [  407.468895] wlan0: RX AssocResp from cc:d5:39:d1:95:90 (capab=0x431 status=0 aid=41)
May 19 09:23:58 Jethro-Laptop kernel: [  407.469141] wlan0: associated
May 19 09:23:58 Jethro-Laptop kernel: [  407.469260] cfg80211: Calling CRDA for country: ZA
May 19 09:23:58 Jethro-Laptop kernel: [  407.473538] cfg80211: Regulatory domain changed to country: ZA
May 19 09:23:58 Jethro-Laptop kernel: [  407.473545] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
May 19 09:23:58 Jethro-Laptop kernel: [  407.473550] cfg80211:   (2402000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm)
May 19 09:23:58 Jethro-Laptop kernel: [  407.473554] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 1700 mBm)
May 19 09:23:58 Jethro-Laptop kernel: [  407.473559] cfg80211:   (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
May 19 09:23:58 Jethro-Laptop kernel: [  407.473563] cfg80211:   (5490000 KHz - 5710000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
May 19 09:23:58 Jethro-Laptop kernel: [  407.473567] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 3000 mBm)
May 19 09:23:58 Jethro-Laptop NetworkManager[767]: <info> (wlan0): supplicant interface state: associating -> associated
May 19 09:23:58 Jethro-Laptop NetworkManager[767]: <info> (wlan0): supplicant interface state: associated -> 4-way handshake
May 19 09:23:58 Jethro-Laptop wpa_supplicant[4100]: wlan0: WPA: Key negotiation completed with cc:d5:39:d1:95:90 [PTK=CCMP GTK=TKIP]
May 19 09:23:58 Jethro-Laptop wpa_supplicant[4100]: wlan0: CTRL-EVENT-CONNECTED - Connection to cc:d5:39:d1:95:90 completed [id=0 id_str=]
May 19 09:23:58 Jethro-Laptop NetworkManager[767]: <info> (wlan0): supplicant interface state: 4-way handshake -> completed
May 19 09:23:58 Jethro-Laptop NetworkManager[767]: <info> (wlan0): roamed from BSSID (none) ((none)) to CC:D5:39:D1:95:90 (eduroam)
May 19 09:23:57 Jethro-Laptop whoopsie[968]: message repeated 6 times: [ offline]
May 19 09:23:58 Jethro-Laptop whoopsie[968]: online
May 19 09:24:00 Jethro-Laptop NetworkManager[767]: <info> wpa_supplicant die count reset
May 19 09:24:06 Jethro-Laptop ntpdate[4228]: adjust time server 91.189.94.4 offset -0.006569 sec
May 19 09:24:12 Jethro-Laptop NetworkManager[767]: <info> (wlan0): IP6 addrconf timed out or failed.
May 19 09:24:12 Jethro-Laptop NetworkManager[767]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
May 19 09:24:12 Jethro-Laptop NetworkManager[767]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) started...
May 19 09:24:12 Jethro-Laptop NetworkManager[767]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) complete.
May 19 09:24:14 Jethro-Laptop wpa_supplicant[4100]: wlan0: CTRL-EVENT-SCAN-STARTED 

Answer 1

在ubuntu中，大多数设备的Wifi驱动程序都在软件包中linux-firmware-nonfree。因此，请安装通用 Wifi 驱动程序。

然后安装 Wicd Wifi 网络管理器并将设备与该网络管理器一起使用。

sudo apt-get install linux-firmware-nonfree wicd wicd-gtk wicd-daemon wicd-cli wicd-curses

Answer 2

如果您的无线网络工作正常，但速度缓慢或断开连接，请检查您周围的其他信号：

 sudo iwlist scan

输出将针对范围内的所有无线信号，包括您​​的信号。

首先查看使用的通道。只有通道 1,6 和 11 在某种程度上不重叠。其他人是否使用与您相同的频道？考虑将您的频道更改为较少使用的频道。

接下来看看信号电平和质量。您的信号强度比您频道上的其他信号强很多吗？电平显示为负数，因此信号越强，负数越小。-56 dBm 电平强于 -79 dBm 电平。如果您的信号电平不比下一个最强的信号电平强 6dBm，您应该尝试：

1) 靠近信号源。
2) 重新调整天线方向（可能天线位于屏幕边缘，因此请将笔记本电脑旋转 90 度。3
）确保没有任何东西阻挡信号，例如文件柜。
4) 尽量不要周围有许多其他试图连接到同一信号源的设备。