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Ubuntu 20.04.4 Wifi 信道 2.4GHz 信号差

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Ubuntu 20.04.4 Wifi 信道 2.4GHz 信号差

我有一台 HP 笔记本电脑，装有 Ubuntu 20.04.4，内核版本：5.15.0-46-generic。通常我在家里使用路由器的 5G 信道，它工作正常。但是当我使用 2.4G 时，它无法连接或信号很差，尽管它在其他设备上表现良好。我在办公室只能使用 2.4G，所以我别无选择。

wlist chan

  no frequency information.

eno1      no frequency information.

wlo1      32 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Channel 36 : 5.18 GHz
          Channel 40 : 5.2 GHz
          Channel 44 : 5.22 GHz
          Channel 48 : 5.24 GHz
          Channel 52 : 5.26 GHz
          Channel 56 : 5.28 GHz
          Channel 60 : 5.3 GHz
          Channel 64 : 5.32 GHz
          Channel 100 : 5.5 GHz
          Channel 104 : 5.52 GHz
          Channel 108 : 5.54 GHz
          Channel 112 : 5.56 GHz
          Channel 116 : 5.58 GHz
          Channel 120 : 5.6 GHz
          Channel 124 : 5.62 GHz
          Channel 128 : 5.64 GHz
          Channel 132 : 5.66 GHz
          Channel 136 : 5.68 GHz
          Channel 140 : 5.7 GHz
          Channel 144 : 5.72 GHz
          Channel 149 : 5.745 GHz
          Current Frequency=5.765 GHz

sudo lshw -C network

  *-network                 
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: eno1
       version: 15
       serial: 10:62:e5:c9:3e:94
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=5.15.0-46-generic firmware=rtl8168h-2_0.0.2 02/26/15 latency=0 link=no multicast=yes port=twisted pair
       resources: irq:16 ioport:4000(size=256) memory:a4104000-a4104fff memory:a4100000-a4103fff
  *-network
       description: Wireless interface
       product: RTL8821CE 802.11ac PCIe Wireless Network Adapter
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlo1
       version: 00
       serial: 74:40:bb:31:83:ab
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rtw_8821ce driverversion=5.15.0-46-generic firmware=N/A ip=192.168.0.102 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:131 ioport:3000(size=256) memory:a4000000-a400ffff

nmcli device wifi list

IN-USE  BSSID              SSID              MODE   CHAN  RATE        SIGNAL  BARS  SECURITY  
        XX:XX:XX:XX:XX:XX  Dip-Home 5G       Infra  153   135 Mbit/s  70      ▂▄▆_  WPA2      
*       XX:XX:XX:XX:XX:XX  Dip-Home          Infra  9     270 Mbit/s  54      ▂▄__  WPA2

这里，“Dip-Home”是2.4G连接，“Dip-Home 5G”是同一路由器的5G连接。“Dip-Home 5G”工作正常，系统每次都尝试按默认优先级连接它。所以我从wifi设置中忘记了“Dip-Home 5G”的连接，这样它就无法优先连接它。然后尝试连接2.4G的“Dip Home”。这个连接很慢，虽然我就在路由器前面。同样的事情到处都在发生。

有人可以提出一些解决方法吗？

答案1

安装rtl8821ce-dkms附加驱动程序或运行：

sudo apt install rtl8821ce-dkms

然后重新启动。

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