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Ubuntu 14.10 可以列出 Wi-Fi 但无法连接

tag-icon • tag-icon networking wireless 14.10 connection
Ubuntu 14.10 可以列出 Wi-Fi 但无法连接

我在 SSD 上安装了 Ubuntu，并将其移动到不同的 PC 上。我在内置 Broadcom 卡的笔记本电脑上使用它，它工作正常。有一天，它停止工作了。奇怪的是，几天前蓝牙也停止工作了，我插入了一个适配器让它工作。这是一台旧笔记本电脑，我卸下了 SSD 并安装了 Windows 8。Wi-Fi 和蓝牙都开始工作了。

然后我将 SSD 放回台式机，之前可以正常工作的 Atheros AR9485 PCIe 卡也无法连接。笔记本电脑和台式机的问题相同。我可以在网络管理器小部件上看到 SSID，但无法连接。它尝试过，但最后还是放弃了。

以下是一些希望有用的信息：

$ lspci -nnk | grep -iA2 net
  01:00.0 Network controller [0280]: Qualcomm Atheros AR9485 Wireless Network Adapter [168c:0032] (rev 01)
  Subsystem: Qualcomm Atheros Device [168c:3118]
  Kernel driver in use: ath9k
$ rfkill list all
  0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
  1: hci0: Bluetooth
  Soft blocked: no
  Hard blocked: no
$ dmesg | tail -n 20
  [  536.278326] wlan0: direct probe to 14:b9:68:63:d6:80 (try 1/3)
  [  536.480236] wlan0: direct probe to 14:b9:68:63:d6:80 (try 2/3)
  [  536.684206] wlan0: direct probe to 14:b9:68:63:d6:80 (try 3/3)
  [  536.888159] wlan0: authentication with 14:b9:68:63:d6:80 timed out
  [  547.642137] wlan0: authenticate with 14:b9:68:63:d6:80
  [  547.655433] wlan0: direct probe to 14:b9:68:63:d6:80 (try 1/3)
  [  547.857571] wlan0: direct probe to 14:b9:68:63:d6:80 (try 2/3)
  [  548.061490] wlan0: direct probe to 14:b9:68:63:d6:80 (try 3/3)
  [  548.265447] wlan0: authentication with 14:b9:68:63:d6:80 timed out
  [  783.833363] perf interrupt took too long (2508 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
  [ 1151.862130] wlan0: authenticate with 14:b9:68:63:d6:80
  [ 1151.875359] wlan0: direct probe to 14:b9:68:63:d6:80 (try 1/3)
  [ 1152.077243] wlan0: direct probe to 14:b9:68:63:d6:80 (try 2/3)
  [ 1152.281196] wlan0: direct probe to 14:b9:68:63:d6:80 (try 3/3)
  [ 1152.485033] wlan0: authentication with 14:b9:68:63:d6:80 timed out
  [ 1163.244460] wlan0: authenticate with 14:b9:68:63:d6:80
  [ 1163.257626] wlan0: direct probe to 14:b9:68:63:d6:80 (try 1/3)
  [ 1163.459545] wlan0: direct probe to 14:b9:68:63:d6:80 (try 2/3)
  [ 1163.663510] wlan0: direct probe to 14:b9:68:63:d6:80 (try 3/3)
  [ 1163.867406] wlan0: authentication with 14:b9:68:63:d6:80 timed out

答案1

我怀疑驱动程序有问题ath9k这个问题在后续的内核版本中已经修复。我建议我们安装ath9k内核版本 3.19 的驱动程序套件。使用临时网络连接，打开终端并执行：

sudo apt-get install build-essential linux-headers-generic
wget https://www.kernel.org/pub/linux/kernel/projects/backports/stable/v3.19-rc1/backports-3.19-rc1-1.tar.gz
tar -zxvf backports-3.19-rc1.tar.gz
cd backports-3.19-rc1
make defconfig-ath9k
make
sudo make install
sudo depmod -a

重新启动并告诉我们是否有任何改进。

如果 Update Manager 安装了较新的 Linux 映像，则在请求的重新启动后，您必须重新编译：

cd backports-3.19-rc1
make clean
make defconfig-ath9k
make
sudo make install
sudo depmod -a

然后重新启动以加载较新的驱动程序。

您也可以尝试驱动程序参数：

sudo -i
echo "options ath9k nohwcrypt=1"  >  /etc/modprobe.d/ath9k.conf
exit

另外，请确保您的路由器设置为 WPA2-AES 而不是 TKIP。重新启动。

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