关于ubuntu16无线网卡RTL8723BE频繁掉线及信号不足的解决办法

最近在新电脑上装了ubuntu16,结果wifi经常连不上,连上了过段时间就掉线,路由器就在电脑的旁边,而且信号非常的若.

但是windows系统没有任何问题,所以就在网上找解决办法,也按照网上的方法试了,结果好多方法都是没用的.

最后从askubuntu上找到了解决方法.

首先要查看本机的无线网卡型号:

 lmtoo@lmtoo:~$ lspci
 :00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev )
 :02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev )
 :03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev )
 :04.0 Signal processing controller: Intel Corporation Broadwell-U Camarillo Device (rev )
 :14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev )
 :16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller # (rev )
 :1b. Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev )
 :1c. PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port # (rev e3)
 :1c. PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port # (rev e3)
 :1c. PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port # (rev e3)
 :1c. PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port # (rev e3)
 :1c. PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port # (rev e3)
 :1d. USB controller: Intel Corporation Wildcat Point-LP USB EHCI Controller (rev )
 :1f. ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev )
 :1f. SATA controller: Intel Corporation Wildcat Point-LP SATA Controller [AHCI Mode] (rev )
 :1f. SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev )
 :00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev )
 :00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter
 :00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101//6E PCI Express Fast/Gigabit Ethernet controller (rev 0a)
 0a:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 940M] (rev a2)

看到第19行的是无线网卡信息,且型号为RTL8723BE.

从网上看到RTL8723系列网卡都有这个频繁掉线的问题,只不过BE版本是更新的版本,添加了一个参数.

再来查看RTL8723BE这块网卡驱动的参数信息,

 lmtoo@lmtoo:~$ modinfo rtl8723be
 filename:       /lib/modules/4.4.--generic/kernel/drivers/net/wireless/realtek/rtlwifi/rtl8723be/rtl8723be.ko
 firmware:       rtlwifi/rtl8723befw.bin
 description:    Realtek 8723BE .11n PCI wireless
 license:        GPL
 author:         Realtek WlanFAE    <wlanfae@realtek.com>
 author:         PageHe    <page_he@realsil.com.cn>
 srcversion:     00619764255210776FAB54D
 alias:          pci:v000010ECd0000B723sv*sd*bc*sc*i*
 depends:        rtlwifi,rtl_pci,btcoexist,mac80211
 vermagic:       4.4.--generic SMP mod_unload modversions
 parm:           swlps:bool
 parm:           swenc:using hardware crypto (default  [hardware])
  (bool)
 parm:           ips:using no link power save (default  is open)
  (bool)
 parm:           fwlps:using linked fw control power save (default  is open)
  (bool)
 parm:           msi:Set to  to use MSI interrupts mode (default )
  (bool)
 parm:           debug:Set debug level (-) (default ) (int)
 parm:           disable_watchdog:Set to  to disable the watchdog (default )
  (bool)
 parm:           ant_sel:Set to  or  to force antenna number (default )
  (int)

看第12行到25行这几个参数,ips和fwlps是用来控制节能的,ant_sel是用来控制信号强度的.最主要的就是修改这几个参数的默认值.

首先我们把配置驱动的文件打开

lmtoo@lmtoo:~$ sudo nano /etc/modprobe.d/rtl8723be.conf

将如下参数黏贴到配置文件中:

options rtl8723be debug=
options rtl8723be disable_watchdog=N
options rtl8723be fwlps=Y
options rtl8723be ips=Y
options rtl8723be msi=N
options rtl8723be swenc=N
options rtl8723be swlps=N
options rtl8723be ant_sel=2

保存配置文件后,运行如下命令来应用配置

lmtoo@lmtoo:~$ sudo modprobe -r rtl8723be
lmtoo@lmtoo:~$ sudo modprobe rtl8723be

是不是信号强了许多?

参考地址:

http://askubuntu.com/questions/526214/how-to-set-parameters-for-realtek-wifi-rtl8723

http://askubuntu.com/questions/635625/realtek-8723be-wifi-problem

http://askubuntu.com/questions/756748/inconsistent-connection-and-super-slow-speed-with-rtl8723be