安装 Ubuntu 14.04 LTS 后...无需更新，一切都运行正常...几分钟后，我的 wifi 断开了无线连接...我必须重新启动才能再次使用它。
我的网络控制器：
瑞昱半导体有限公司 RTL8723BE PCIe 无线网络适配器
正在使用的内核驱动：rtl8723be
我使用了以下脚本http://ubuntuforums.org/showthread.php?t=370108
########## wireless info START ##########
Report from: 06 Jun 2015 12:41 CDT -0500
Booted last: 06 Jun 2015 12:08 CDT -0500
Script from: 21 May 2015 09:10 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty
##### kernel ############################
Linux 3.16.0-30-generic #40~14.04.1-Ubuntu SMP Thu Jan 15 17:43:14 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
08:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
Subsystem: Lenovo Device [17aa:b736]
Kernel driver in use: rtl8723be
09:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 10)
Subsystem: Lenovo Device [17aa:380d]
Kernel driver in use: r8169
##### lsusb #############################
Bus 002 Device 002: ID 8087:8000 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 004: ID 045e:0782 Microsoft Corp.
Bus 003 Device 003: ID 0bda:b728 Realtek Semiconductor Corp.
Bus 003 Device 002: ID 174f:14b8 Syntek
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### rfkill ############################
0: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
1: hci0: Bluetooth
Soft blocked: yes
Hard blocked: no
2: ideapad_bluetooth: Bluetooth
Soft blocked: yes
Hard blocked: no
3: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
##### lsmod #############################
rtl8723be 85054 0
btcoexist 50304 1 rtl8723be
rtl8723_common 23361 1 rtl8723be
rtl_pci 26690 1 rtl8723be
rtlwifi 64255 2 rtl_pci,rtl8723be
mac80211 652718 3 rtl_pci,rtlwifi,rtl8723be
mxm_wmi 13021 1 nouveau
cfg80211 494330 2 mac80211,rtlwifi
ideapad_laptop 18278 0
sparse_keymap 13948 1 ideapad_laptop
wmi 19193 2 mxm_wmi,nouveau
##### interfaces ########################
auto lo
iface lo inet loopback
##### ifconfig ##########################
eth0 Link encap:Ethernet HWaddr <MAC 'eth0' [IF]>
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
vmnet1 Link encap:Ethernet HWaddr <MAC 'vmnet1' [IF]>
inet addr:172.16.229.1 Bcast:172.16.229.255 Mask:255.255.255.0
inet6 addr: fe80::250:56ff:fec0:1/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:59 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
vmnet8 Link encap:Ethernet HWaddr <MAC 'vmnet8' [IF]>
inet addr:192.168.42.1 Bcast:192.168.42.255 Mask:255.255.255.0
inet6 addr: fe80::250:56ff:fec0:8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:59 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
wlan0 Link encap:Ethernet HWaddr <MAC 'wlan0' [IF]>
inet addr:192.168.1.72 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::2e33:7aff:fe18:82d5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:25404 errors:0 dropped:0 overruns:0 frame:0
TX packets:20720 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:19104265 (19.1 MB) TX bytes:3957097 (3.9 MB)
##### iwconfig ##########################
eth0 no wireless extensions.
vmnet1 no wireless extensions.
vmnet8 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"ManzanaVILot176"
Mode:Managed Frequency:2.462 GHz Access Point: <MAC 'ManzanaVILot176' [AC1]>
Bit Rate=18 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
Link Quality=46/70 Signal level=-64 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:57 Missed beacon:0
##### route #############################
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 wlan0
172.16.229.0 0.0.0.0 255.255.255.0 U 0 0 0 vmnet1
192.168.1.0 0.0.0.0 255.255.255.0 U 9 0 0 wlan0
192.168.42.0 0.0.0.0 255.255.255.0 U 0 0 0 vmnet8
##### resolv.conf #######################
nameserver 127.0.1.1
search gateway.2wire.net
##### network managers ##################
Installed:
NetworkManager
Running:
root 931 1 0 12:08 ? 00:00:00 NetworkManager
##### NetworkManager info ###############
NetworkManager Tool
State: connected (global)
- Device: eth0 -----------------------------------------------------------------
Type: Wired
Driver: r8169
State: unavailable
Default: no
HW Address: <MAC 'eth0' [IF]>
Capabilities:
Carrier Detect: yes
Wired Properties
Carrier: off
- Device: wlan0 [ManzanaVILot176] ---------------------------------------------
Type: 802.11 WiFi
Driver: rtl8723be
State: connected
Default: yes
HW Address: <MAC 'wlan0' [IF]>
Capabilities:
Speed: 18 Mb/s
Wireless Properties
WEP Encryption: yes
WPA Encryption: yes
WPA2 Encryption: yes
Wireless Access Points (* = current AP)
INFINITUMc7qc: Infra, <MAC 'INFINITUMc7qc' [AN1]>, Freq 2412 MHz, Rate 54 Mb/s, Strength 100 WPA WPA2
Zandunga: Infra, <MAC 'Zandunga' [AN2]>, Freq 2437 MHz, Rate 54 Mb/s, Strength 100 WPA2
*ManzanaVILot176:Infra, <MAC 'ManzanaVILot176' [AC1]>, Freq 2462 MHz, Rate 54 Mb/s, Strength 82 WPA
Motorola: Infra, <MAC 'Motorola' [AN4]>, Freq 2412 MHz, Rate 54 Mb/s, Strength 100 WPA2
IPv4 Settings:
Address: 192.168.1.72
Prefix: 24 (255.255.255.0)
Gateway: 192.168.1.254
DNS: 192.168.1.254
##### NetworkManager.state ##############
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
##### NetworkManager.conf ###############
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=false
##### NetworkManager profiles ###########
[[/etc/NetworkManager/system-connections/PEMEX MOVIL]] (600 root)
[ipv6] method=auto
[connection] id=PEMEX MOVIL | type=802-11-wireless
[802-11-wireless] ssid=PEMEX MOVIL | mac-address=<MAC 'wlan0' [IF]>
[ipv4] method=auto
[[/etc/NetworkManager/system-connections/ManzanaVILot176]] (600 root)
[connection] id=ManzanaVILot176 | type=802-11-wireless
[802-11-wireless] ssid=ManzanaVILot176 | mac-address=<MAC 'wlan0' [IF]>
[ipv4] method=auto
[ipv6] method=auto
##### iw reg get ########################
Region: America/Mexico_City (based on set time zone)
country US:
(2402 - 2472 @ 40), (3, 27)
(5170 - 5250 @ 40), (3, 17)
(5250 - 5330 @ 40), (3, 20), DFS
(5490 - 5600 @ 40), (3, 20), DFS
(5650 - 5710 @ 40), (3, 20), DFS
(5735 - 5835 @ 40), (3, 30)
(57240 - 63720 @ 2160), (N/A, 40)
##### iwlist channels ###################
eth0 no frequency information.
vmnet1 no frequency information.
vmnet8 no frequency information.
lo no frequency information.
wlan0 11 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
Current Frequency:2.462 GHz (Channel 11)
##### iwlist scan #######################
eth0 Interface doesn't support scanning.
vmnet1 Interface doesn't support scanning.
vmnet8 Interface doesn't support scanning.
lo Interface doesn't support scanning.
Channel occupancy:
1 APs on Frequency:2.462 GHz (Channel 11)
wlan0 Scan completed :
Cell 01 - Address: <MAC 'ManzanaVILot176' [AC1]>
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=70/70 Signal level=-32 dBm
Encryption key:on
ESSID:"ManzanaVILot176"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=0000001795c479af
Extra: Last beacon: 0ms ago
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : PSK
##### module infos ######################
[rtl8723be]
filename: /lib/modules/3.16.0-30-generic/kernel/drivers/net/wireless/rtlwifi/rtl8723be/rtl8723be.ko
firmware: rtlwifi/rtl8723befw.bin
description: Realtek 8723BE 802.11n PCI wireless
license: GPL
author: Realtek WlanFAE <[email protected]>
author: PageHe <[email protected]>
srcversion: C94095C986767A931B924EF
depends: rtlwifi,rtl8723-common,rtl_pci,btcoexist,mac80211
intree: Y
vermagic: 3.16.0-30-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: 7B:E2:A7:20:0F:17:F0:0C:A0:11:F7:0E:5A:87:4C:37:E3:E0:F6:BE
sig_hashalgo: sha512
parm: swlps:bool
parm: swenc:using hardware crypto (default 0 [hardware])
(bool)
parm: ips:using no link power save (default 1 is open)
(bool)
parm: fwlps:using linked fw control power save (default 1 is open)
(bool)
parm: msi:Set to 1 to use MSI interrupts mode (default 0)
(bool)
parm: debug:Set debug level (0-5) (default 0) (int)
[rtl8723_common]
filename: /lib/modules/3.16.0-30-generic/kernel/drivers/net/wireless/rtlwifi/rtl8723com/rtl8723-common.ko
description: Realtek RTL8723AE/RTL8723BE 802.11n PCI wireless common routines
license: GPL
author: Larry Finger <[email protected]>
author: Realtek WlanFAE <[email protected]>
srcversion: 7410431A59C24B1BC33226E
depends:
intree: Y
vermagic: 3.16.0-30-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: 7B:E2:A7:20:0F:17:F0:0C:A0:11:F7:0E:5A:87:4C:37:E3:E0:F6:BE
sig_hashalgo: sha512
[rtl_pci]
filename: /lib/modules/3.16.0-30-generic/kernel/drivers/net/wireless/rtlwifi/rtl_pci.ko
description: PCI basic driver for rtlwifi
license: GPL
author: Larry Finger <[email protected]>
author: Realtek WlanFAE <[email protected]>
author: lizhaoming <[email protected]>
srcversion: 3273ECD6028617EFD27E4F4
depends: mac80211,rtlwifi
intree: Y
vermagic: 3.16.0-30-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: 7B:E2:A7:20:0F:17:F0:0C:A0:11:F7:0E:5A:87:4C:37:E3:E0:F6:BE
sig_hashalgo: sha512
[rtlwifi]
filename: /lib/modules/3.16.0-30-generic/kernel/drivers/net/wireless/rtlwifi/rtlwifi.ko
description: Realtek 802.11n PCI wireless core
license: GPL
author: Larry Finger <[email protected]>
author: Realtek WlanFAE <[email protected]>
author: lizhaoming <[email protected]>
srcversion: 8362106E96F806A9DBAE565
depends: mac80211,cfg80211
intree: Y
vermagic: 3.16.0-30-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: 7B:E2:A7:20:0F:17:F0:0C:A0:11:F7:0E:5A:87:4C:37:E3:E0:F6:BE
sig_hashalgo: sha512
[mac80211]
filename: /lib/modules/3.16.0-30-generic/kernel/net/mac80211/mac80211.ko
license: GPL
description: IEEE 802.11 subsystem
srcversion: D421794D4F30DF3A540FD24
depends: cfg80211
intree: Y
vermagic: 3.16.0-30-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: 7B:E2:A7:20:0F:17:F0:0C:A0:11:F7:0E:5A:87:4C:37:E3:E0:F6:BE
sig_hashalgo: sha512
parm: max_nullfunc_tries:Maximum nullfunc tx tries before disconnecting (reason 4). (int)
parm: max_probe_tries:Maximum probe tries before disconnecting (reason 4). (int)
parm: beacon_loss_count:Number of beacon intervals before we decide beacon was lost. (int)
parm: probe_wait_ms:Maximum time(ms) to wait for probe response before disconnecting (reason 4). (int)
parm: ieee80211_default_rc_algo:Default rate control algorithm for mac80211 to use (charp)
[cfg80211]
filename: /lib/modules/3.16.0-30-generic/kernel/net/wireless/cfg80211.ko
description: wireless configuration support
license: GPL
author: Johannes Berg
srcversion: DEE8EAA48495E392CD51C2D
depends:
intree: Y
vermagic: 3.16.0-30-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: 7B:E2:A7:20:0F:17:F0:0C:A0:11:F7:0E:5A:87:4C:37:E3:E0:F6:BE
sig_hashalgo: sha512
parm: ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)
parm: cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)
##### module parameters #################
[rtl8723be]
debug: 0
fwlps: Y
ips: Y
msi: N
swenc: N
swlps: N
[mac80211]
beacon_loss_count: 7
ieee80211_default_rc_algo: minstrel_ht
max_nullfunc_tries: 2
max_probe_tries: 5
probe_wait_ms: 500
[cfg80211]
cfg80211_disable_40mhz_24ghz: N
ieee80211_regdom: 00
##### /etc/modules ######################
lp
rtc
##### modprobe options ##################
[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci
[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist i2c_i801
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac
[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off
[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
[/etc/modprobe.d/mlx4.conf]
softdep mlx4_core post: mlx4_en
[/etc/modprobe.d/modesetting.conf]
options cirrus modeset=1
options mgag200 modeset=1
[/etc/modprobe.d/vmware-fuse.conf]
alias char-major-10-229 fuse
##### rc.local ##########################
exit 0
##### pm-utils ##########################
##### udev rules ########################
[/etc/udev/rules.d/70-persistent-net.rules]
# PCI device 0x10ec:0x8168 (r8169)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'eth0' [IF]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x10ec:0xb723 (rtl8723be)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'wlan0' [IF]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"
##### dmesg #############################
[ 14.797584] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 17.537314] wlan0: authenticate with <MAC 'ManzanaVILot176' [AC1]>
[ 17.557419] wlan0: send auth to <MAC 'ManzanaVILot176' [AC1]> (try 1/3)
[ 17.559066] wlan0: authenticated
[ 17.559222] rtl8723be 0000:08:00.0 wlan0: disabling HT/VHT due to WEP/TKIP use
[ 17.559226] rtl8723be 0000:08:00.0 wlan0: disabling HT as WMM/QoS is not supported by the AP
[ 17.559228] rtl8723be 0000:08:00.0 wlan0: disabling VHT as WMM/QoS is not supported by the AP
[ 17.561054] wlan0: associate with <MAC 'ManzanaVILot176' [AC1]> (try 1/3)
[ 17.565123] wlan0: RX AssocResp from <MAC 'ManzanaVILot176' [AC1]> (capab=0x431 status=0 aid=2)
[ 17.565270] wlan0: associated
[ 17.565277] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 17.630615] bridge-wlan0: device is wireless, enabling SMAC
[ 17.630617] bridge-wlan0: up
[ 17.630619] bridge-wlan0: attached
[ 17.630912] wlan0: deauthenticating from <MAC 'ManzanaVILot176' [AC1]> by local choice (Reason: 2=PREV_AUTH_NOT_VALID)
[ 17.663519] wlan0: authenticate with <MAC 'ManzanaVILot176' [AC1]>
[ 17.673669] wlan0: send auth to <MAC 'ManzanaVILot176' [AC1]> (try 1/3)
[ 17.673891] bridge-wlan0: disabling the bridge
[ 17.675828] wlan0: authenticated
[ 17.675922] rtl8723be 0000:08:00.0 wlan0: disabling HT/VHT due to WEP/TKIP use
[ 17.675924] rtl8723be 0000:08:00.0 wlan0: disabling HT as WMM/QoS is not supported by the AP
[ 17.675926] rtl8723be 0000:08:00.0 wlan0: disabling VHT as WMM/QoS is not supported by the AP
[ 17.677178] wlan0: associate with <MAC 'ManzanaVILot176' [AC1]> (try 1/3)
[ 17.679555] wlan0: RX AssocResp from <MAC 'ManzanaVILot176' [AC1]> (capab=0x431 status=0 aid=2)
[ 17.679703] wlan0: associated
[ 17.689281] bridge-wlan0: down
[ 17.689287] bridge-wlan0: detached
[ 17.755541] bridge-wlan0: device is wireless, enabling SMAC
[ 17.755543] bridge-wlan0: up
[ 17.755546] bridge-wlan0: attached
########## wireless info END ############
答案1
经过大量的谷歌搜索后，我找到了一个最近贴文使用新固件。
- 下载rtl8723befw.bin，将其复制到/lib/固件/rtlwifi/然后重新启动笔记本电脑。
禁用驱动程序的睡眠功能：
$ echo "options rtl8723be fwlps=0" | sudo tee /etc/modprobe.d/rtl8723be.conf（我还找到了使用的信息
options rtl8723be fwlps=N ips=N，它可以禁用该ips选项，但我发现没有必要使用它）
我还在很多帖子中看到蓝牙可能会破坏 WiFi 连接，所以我也永久禁用了它：（
$ sudo rfkill block bluetooth $ sudo update-rc.d bluetooth disable
并使用 检查它是否已关闭sudo service bluetooth status）
[如果您发现仍然遇到 WiFi 突然断线的问题，您可以使用 重新加载相关模块sudo rmmod rtl8723be && sudo modprobe rtl8723be，而不必重新启动整个系统]
答案2
当我在多个论坛上花了很多时间时，我遇到了这个问题联想 G40和HP 笔记本 15-ac122tu，我发现这是 Ubuntu 14.04 上 WiFi 无法工作或间歇性停止工作的一个相当常见的问题。
对我来说，以下三个链接是相关的：
1）如何使 Realtek RTL8723BE 无线网卡工作？
2）Ubuntu 14.04 中 rtl8723be 的 Wifi 问题
3）我的 Wifi 几分钟后就断开连接 realtek8723be（这个帖子）
对我有用的是这三篇帖子和一些故障排除的混合。
我认为，Ubuntu 主线软件包中针对 Broadcom 或 Realtek WiFi 适配器的永久修复将对用户有所帮助。这将大大提高 Ubuntu 的用户友好度。请记住，音频和图形问题曾经非常普遍，最近无线适配器也出现了同样的问题。