從安裝上ubuntu16.04有好幾個月了，每次都會遇到這樣的問題：電腦是雙系統的，在window系統下連線到同一個wifi訊號強，也不掉線。非常穩定，一切換到ubuntu系統就老掉線，掉線就半天連不上。今天在網上檢視，終於解決了這個問題！問題處在此版本的系統配備的無線網絡卡的引數為省電節能模式，訊號強度不行。需要修改引數來重啟下wifi，就可以了。

1 [email protected]:~$ lspci 2 00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09) 3 00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09) 4 00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09) 5 00:04.0 Signal processing controller: Intel Corporation Broadwell-U Camarillo Device (rev 09) 6 00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03) 7 00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03) 8 00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03) 9 00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 (rev e3) 10 00:1c.1 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #2 (rev e3) 11 00:1c.2 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #3 (rev e3) 12 00:1c.3 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #4 (rev e3) 13 00:1c.4 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #5 (rev e3) 14 00:1d.0 USB controller: Intel Corporation Wildcat Point-LP USB EHCI Controller (rev 03) 15 00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03) 16 00:1f.2 SATA controller: Intel Corporation Wildcat Point-LP SATA Controller [AHCI Mode] (rev 03) 17 00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03) 18 02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev 01) 19 08:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter 20 09:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller (rev 0a) 21 0a:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 940M] (rev a2)

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看到第19行的是無線網絡卡資訊,且型號為RTL8723BE.

從網上看到RTL8723系列網絡卡都有這個頻繁掉線的問題,只不過BE版本是更新的版本,添加了一個引數.

再來檢視RTL8723BE這塊網絡卡驅動的引數資訊,

1 [email protected]:~$ modinfo rtl8723be 2 filename: /lib/modules/4.4.0-22-generic/kernel/drivers/net/wireless/realtek/rtlwifi/rtl8723be/rtl8723be.ko 3 firmware: rtlwifi/rtl8723befw.bin 4 description: Realtek 8723BE 802.11n PCI wireless 5 license: GPL 6 author: Realtek WlanFAE

[email protected] 7 author: PageHe [email protected] 8 srcversion: 00619764255210776FAB54D 9 alias: pci:v000010ECd0000B723svsdbcsci* 10 depends: rtlwifi,rtl_pci,btcoexist,mac80211 11 vermagic: 4.4.0-22-generic SMP mod_unload modversions 12 parm: swlps:bool 13 parm: swenc:using hardware crypto (default 0 [hardware]) 14 (bool) 15 parm: ips:using no link power save (default 1 is open) 16 (bool) 17 parm: fwlps:using linked fw control power save (default 1 is open) 18 (bool) 19 parm: msi:Set to 1 to use MSI interrupts mode (default 0) 20 (bool) 21 parm: debug:Set debug level (0-5) (default 0) (int) 22 parm: disable_watchdog:Set to 1 to disable the watchdog (default 0) 23 (bool) 24 parm: ant_sel:Set to 1 or 2 to force antenna number (default 0) 25 (int)

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看第12行到25行這幾個引數,ips和fwlps是用來控制節能的,ant_sel是用來控制訊號強度的.最主要的就是修改這幾個引數的預設值.

首先我們把配置驅動的檔案開啟

[email protected]:~$ sudo nano /etc/modprobe.d/rtl8723be.conf

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將如下引數黏貼到配置檔案中:

options rtl8723be debug=1 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

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ctrl+o儲存配置檔案後,執行如下命令來重啟應用，更新wifi配置資訊。

[email protected]:~$ sudo modprobe -r rtl8723be [email protected]:~$ sudo modprobe rtl8723be

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是不是訊號強了許多?