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Ubuntu 16.04 LTS 上的 Wifi 不稳定（RTL8821AE）

tag-icon • tag-icon 16.04 networking wireless realtek-wireless
Ubuntu 16.04 LTS 上的 Wifi 不稳定（RTL8821AE）

一开始 wifi 根本无法使用（什么都没显示）。但按照一些指南操作后，我认为我通过禁用一些硬阻止设置解决了这个问题。

但是现在我可以使用 wifi 半分钟，然后断线几分钟，然后这个循环重复。当连接断开时，图标显示我仍处于连接状态，并且我仍然可以看到可用的网络。但尝试重新连接会失败。我进行了双启动，在 Windows 10 上 wifi 运行正常。

我尝试关闭 IPv6，但由于没有效果，我又重新启用了它。我还尝试了一些显然不适合我的卡的解决方案，所以我恢复了它。

信息：

网卡（运行 lshw -class 网络）：

*-network
    description: Wireless interface
    product: RTL8821AE 802.11ac PCIe Wireless Network Adapter
    vendor: Realtek Semiconductor Co., Ltd.
    physical id: 0
    bus info: pci@0000:03:00.0
    logical name: wlp3s0
    version: 00
    serial: 60:14:b3:b4:f5:bb
    width: 64 bits
    clock: 33MHz
    capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
    configuration: broadcast=yes driver=rtl8821ae driverversion=4.10.0-42-generic firmware=N/A ip=192.168.38.108 latency=0 link=yes multicast=yes wireless=IEEE 802.11
    resources: irq:329 ioport:4000(size=256) memory:a4200000-a4203fff
*-network
    description: Ethernet interface
    product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
    vendor: Realtek Semiconductor Co., Ltd.
    physical id: 0
    bus info: pci@0000:04:00.0
    logical name: enp4s0
    version: 10
    serial: 54:e1:ad:9b:4e:af
    size: 1Gbit/s
    capacity: 1Gbit/s
    width: 64 bits
    clock: 33MHz
    capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
    configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8168g-3_0.0.1 04/23/13 ip=192.168.38.110 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
    resources: irq:321 ioport:3000(size=256) memory:a4104000-a4104fff memory:a4100000-a4103fff:3000(size=256) memory:a4104000-a4104fff memory:a4100000-a4103fff

没有软块或硬块

USB 无线网卡（lsusb）：

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 04f2:b57e Chicony Electronics Co., Ltd 
Bus 001 Device 002: ID 046d:c051 Logitech, Inc. G3 (MX518) Optical Mouse
Bus 001 Device 004: ID 0bda:0821 Realtek Semiconductor Corp. 
Bus 001 Device 006: ID 04e8:6860 Samsung Electronics Co., Ltd Galaxy (MTP)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

PCI 无线网卡 (lscpi)

00:00.0 Host bridge: Intel Corporation Device 5910 (rev 05)
00:01.0 PCI bridge: Intel Corporation Sky Lake PCIe Controller (x16) (rev 05)
00:02.0 VGA compatible controller: Intel Corporation Device 591b (rev 04)
00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller (rev 31)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-H Thermal subsystem (rev 31)
00:16.0 Communication controller: Intel Corporation Sunrise Point-H CSME HECI #1 (rev 31)
00:17.0 SATA controller: Intel Corporation Sunrise Point-H SATA Controller [AHCI mode] (rev 31)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #2 (rev f1)
00:1c.2 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #3 (rev f1)
00:1c.3 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #4 (rev f1)
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #9 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-H LPC Controller (rev 31)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-H PMC (rev 31)
00:1f.3 Audio device: Intel Corporation Device a171 (rev 31)
00:1f.4 SMBus: Intel Corporation Sunrise Point-H SMBus (rev 31)
01:00.0 3D controller: NVIDIA Corporation Device 1c8d (rev a1)
02:00.0 SD Host controller: O2 Micro, Inc. Device 8621 (rev 01)
03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821AE 802.11ac PCIe Wireless Network Adapter
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)
05:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd Device a804

答案1

我遇到了同样的问题，后来我才知道这与打开的无线网卡有关Power Management。每次 Wifi（我的设备连接的）信号功率下降时，设备就会断开与网络的连接。

因此，要关闭电源管理，首先检查的输出iwconfig command。

$ iwconfig

enp7s0    no wireless extensions.

lo        no wireless extensions.

wlp6s0    IEEE 802.11abgn  ESSID:"Avni.LoveLace"  
          Mode:Managed  Frequency:2.442 GHz  Access Point: C8:D7:79:A1:CE:E4   
          Bit Rate=72.2 Mb/s   Tx-Power=22 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=61/70  Signal level=-49 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:722   Missed beacon:0

看看Power Management:on，然后输入以下代码将其关闭

$ iwconfig wlp6s0 power off

wlp6s0无线接口在哪里。

有时有效，有时无效。如果这对您没有帮助，则需要更改电源管理的网络配置。

  1. 编辑powersave值/etc/NetworkManager/conf.d/default-wifi-powersave-on.conf

    powersave 的可能值为：

    NM_SETTING_WIRELESS_POWERSAVE_DEFAULT (0): use the default value
NM_SETTING_WIRELESS_POWERSAVE_IGNORE (1): don't touch existing setting
NM_SETTING_WIRELESS_POWERSAVE_DISABLE (2): disable powersave
NM_SETTING_WIRELESS_POWERSAVE_ENABLE (3): enable powersave

    打开文件并将省电值从 编辑为2。这将禁用省电。默认情况下

    wifi.powersave = 3

    只需将其更改为值 2。

    wifi.powersave = 2

    保存并重新启动系统，您就完成了！

  2. 为无线电源管理创建黑名单文件

很好地解释了@sagarchalise 关于该主题的回答

如果无线电源管理出了问题，我认为这些方法之一应该对你有用。如果没有，那么请随意编辑以添加更多内容。

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