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HP Stream 13、rtl8723be 上的 Xubuntu 18.04 中的 WiFi 信号弱（不是天线选择，它什么也不做）

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HP Stream 13、rtl8723be 上的 Xubuntu 18.04 中的 WiFi 信号弱（不是天线选择，它什么也不做）

编辑：已经提到了两种解决方案，但对我来说不起作用：

  1. 更改 wifi 驱动程序上的天线选择。这对我的问题不起作用。它似乎曾经适用于 16.04 LTS，但该修复显然在 18.04 中被破坏了。这是 Xubuntu 的新安装，如果可以的话，我想继续使用 18.04。

  2. 将内核回滚到 4.15.0-32-generic。这可能是正确的方向，因为似乎 4.15.0-33 及更高版本的 RTL8723BE 驱动程序存在已知错误，但链接的解决方案适用于 Ubuntu 本身，并让用户启动到高级选项。我正在运行 Xubuntu，我的启动菜单没有高级选项。同样，这是 Xubuntu 的全新安装，所以我没有几周前的任何先前内核版本，而且我还没能弄清楚如何在 Xubuntu 发行版中尝试回滚内核。

我刚刚在我的 HP Stream 13-110ca 上安装了 Xubuntu 18.04，因为 Windows 10 需要的存储空间比 32GB SSD 更大。

我在 WiFi 方面遇到了很多困难。它有一个 rtl8723be 无线网卡，很多其他帖子都建议切换天线数量，但似乎都没有什么区别。无论我选择什么，每个选项的强度都在 -65 dbm 左右。

切换之前，WiFi 在 Windows 10 中运行良好，所以我知道天线已连接。

产品编号：P4B15UA#ABL

请指教。

提前致谢，

莎拉

以下是 inxi -Fxz 的输出：

sarah@sarah-HP-Stream-Notebook-PC-13:~$ inxi -Fxz
System:    Host: sarah-HP-Stream-Notebook-PC-13 Kernel: 4.15.0-33-generic x86_64
           bits: 64 gcc: 7.3.0
           Desktop: Xfce 4.12.3 (Gtk 2.24.31) Distro: Ubuntu 18.04.1 LTS
Machine:   Device: laptop System: HP product: HP Stream Notebook PC 13 v: Type1ProductConfigId serial: N/A
           Mobo: HP model: 817D v: 39.13 serial: N/A
           UEFI: Insyde v: F.1B date: 01/05/2016
Battery    BAT0: charge: 35.4 Wh 100.0% condition: 35.4/35.4 Wh (100%)
           model: Hewlett-Packard Primary status: Full
CPU:       Dual core Intel Celeron N3050 (-MCP-) 
           arch: Airmont rev.3 cache: 1024 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 6400
           clock speeds: max: 2160 MHz 1: 481 MHz 2: 638 MHz
Graphics:  Card: Intel Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller
           bus-ID: 00:02.0
           Display Server: x11 (X.Org 1.19.6 )
           drivers: modesetting (unloaded: fbdev,vesa)
           Resolution: [email protected]
           OpenGL: renderer: Mesa DRI Intel HD Graphics 400 (Braswell)
           version: 4.5 Mesa 18.0.5 Direct Render: Yes
Audio:     Card Intel Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series High Def. Audio Controller
           driver: snd_hda_intel bus-ID: 00:1b.0
           Sound: Advanced Linux Sound Architecture v: k4.15.0-33-generic
Network:   Card: Realtek RTL8723BE PCIe Wireless Network Adapter
           driver: rtl8723be port: 1000 bus-ID: 02:00.0
           IF: wlo1 state: up mac: <filter>
Drives:    HDD Total Size: NA (-)
           ID-1: /dev/mmcblk0 model: N/A size: 31.3GB
Partition: ID-1: / size: 29G used: 5.9G (22%) fs: ext4 dev: /dev/mmcblk0p2
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 44.0C mobo: N/A
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 160 Uptime: 11 min Memory: 766.1/1853.0MB
           Init: systemd runlevel: 5 Gcc sys: N/A
           Client: Shell (bash 4.4.191) inxi: 2.3.56 
sarah@sarah-HP-Stream-Notebook-PC-13:~$

以下是 lspci; lsusb 的输出

sarah@sarah-HP-Stream-Notebook-PC-13:~$ lspci; lsusb
00:00.0 Host bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series SoC Transaction Register (rev 21)
00:02.0 VGA compatible controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller (rev 21)
00:0b.0 Signal processing controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series Power Management Controller (rev 21)
00:14.0 USB controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series USB xHCI Controller (rev 21)
00:1a.0 Encryption controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series Trusted Execution Engine (rev 21)
00:1b.0 Audio device: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series High Definition Audio Controller (rev 21)
00:1c.0 PCI bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCI Express Port #1 (rev 21)
00:1c.3 PCI bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCI Express Port #4 (rev 21)
00:1f.0 ISA bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCU (rev 21)
00:1f.3 SMBus: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx SMBus Controller (rev 21)
01:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5229 PCI Express Card Reader (rev 01)
02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 0bda:b006 Realtek Semiconductor Corp. 
Bus 001 Device 008: ID 0bb4:0ffe HTC (High Tech Computer Corp.) Desire HD (modem mode)
Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 002: ID 05c8:0379 Cheng Uei Precision Industry Co., Ltd (Foxlink) 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
sarah@sarah-HP-Stream-Notebook-PC-13:~$

以下是 iwconfig 的输出

sarah@sarah-HP-Stream-Notebook-PC-13:~$ iwconfig
enp0s20u4u2  no wireless extensions.

wlo1      IEEE 802.11  ESSID:"Chester"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: AC:20:2E:D4:58:08   
          Bit Rate=72.2 Mb/s   Tx-Power=20 dBm   
          Retry short limit:7   RTS thr=2347 B   Fragment thr:off
          Power Management:on
          Link Quality=44/70  Signal level=-66 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:3922   Missed beacon:0

lo        no wireless extensions.

sarah@sarah-HP-Stream-Notebook-PC-13:~$

答案1

此内核已修复该错误：

http://kernel.ubuntu.com/~jsalisbury/lp1788997

只要您选择天线 1：

modprobe rtl8723be ant_sel=1

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