我的 Wifi 连接完美，信号强度良好，但有时就是无法连接，或者连接速度非常慢，无法正常工作。同一台笔记本电脑（Lenovo Flex 2-14）上的 Windows 8 连接运行顺畅。
启动后，它工作正常，但几分钟后问题就出现了。wifi 适配器不再响应，我无法再（重新/断开）与路由器的连接。我必须重新启动才能让它再次工作......
########## wireless info START ##########
Report from: 26 Mar 2015 10:56 CET +0100
Booted last: 26 Mar 2015 10:53 CET +0100
Script from: 20 Sep 2014 23:04 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty
##### kernel ############################
Linux 3.16.0-33-generic #44~14.04.1-Ubuntu SMP Fri Mar 13 10:33:29 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
Subsystem: Lenovo Device [17aa:b736]
Kernel driver in use: rtl8723be
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 10)
Subsystem: Lenovo Device [17aa:3810]
Kernel driver in use: r8169
##### lsusb #############################
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 04f3:0447 Elan Microelectronics Corp.
Bus 001 Device 003: ID 0bda:b728 Realtek Semiconductor Corp.
Bus 001 Device 002: ID 5986:055e Acer, Inc
Bus 001 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: ideapad_bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: no
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
cfg80211 494362 2 mac80211,rtlwifi
snd_soc_rt5640 93042 0
snd_soc_rl6231 13037 1 snd_soc_rt5640
snd_soc_core 200204 1 snd_soc_rt5640
snd_pcm 104112 7 snd_soc_rt5640,snd_soc_core,snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller,snd_pcm_dmaengine
wmi 19193 0
ideapad_laptop 18278 0
sparse_keymap 13948 1 ideapad_laptop
##### 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)
wlan0 Link encap:Ethernet HWaddr <MAC 'wlan0' [IF]>
inet addr:10.0.0.26 Bcast:10.0.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1174 errors:0 dropped:0 overruns:0 frame:0
TX packets:1036 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:665425 (665.4 KB) TX bytes:140032 (140.0 KB)
##### iwconfig ##########################
eth0 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"WichtelLAN"
Mode:Managed Frequency:2.462 GHz Access Point: <MAC 'WichtelLAN' [AC1]>
Bit Rate=65 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
Link Quality=70/70 Signal level=-40 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:8 Missed beacon:0
##### route #############################
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.0.0.138 0.0.0.0 UG 0 0 0 wlan0
10.0.0.0 0.0.0.0 255.255.255.0 U 9 0 0 wlan0
##### resolv.conf #######################
nameserver 127.0.1.1
search home
##### nm-tool ###########################
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 [WichtelLAN] --------------------------------------------------
Type: 802.11 WiFi
Driver: rtl8723be
State: connected
Default: yes
HW Address: <MAC 'wlan0' [IF]>
Capabilities:
Speed: 65 Mb/s
Wireless Properties
WEP Encryption: yes
WPA Encryption: yes
WPA2 Encryption: yes
Wireless Access Points (* = current AP)
foo: Infra, <MAC 'foo' [AC3]>, Freq 2462 MHz, Rate 54 Mb/s, Strength 80 WPA WPA2
UPC2038313: Infra, <MAC 'UPC2038313' [AC8]>, Freq 2412 MHz, Rate 54 Mb/s, Strength 74 WPA WPA2
foo: Infra, <MAC 'foo' [AC2]>, Freq 2462 MHz, Rate 54 Mb/s, Strength 67 WPA WPA2
1ADialup: Infra, <MAC '1ADialup' [AN4]>, Freq 2412 MHz, Rate 54 Mb/s, Strength 64 WPA WPA2
WichtelLAN_EXT: Infra, <MAC 'WichtelLAN_EXT' [AC4]>, Freq 2462 MHz, Rate 54 Mb/s, Strength 64 WPA2
UPC2757394: Infra, <MAC 'UPC2757394' [AC6]>, Freq 2462 MHz, Rate 54 Mb/s, Strength 57 WPA WPA2
BIBULE: Infra, <MAC 'BIBULE' [AC7]>, Freq 2462 MHz, Rate 54 Mb/s, Strength 54 WPA
*WichtelLAN: Infra, <MAC 'WichtelLAN' [AC1]>, Freq 2462 MHz, Rate 54 Mb/s, Strength 80 WPA2
UPC0397341: Infra, <MAC 'UPC0397341' [AC12]>, Freq 2437 MHz, Rate 54 Mb/s, Strength 67 WPA WPA2
UPC0055582: Infra, <MAC 'UPC0055582' [AN10]>, Freq 2437 MHz, Rate 54 Mb/s, Strength 60 WPA WPA2
UPC2126316: Infra, <MAC 'UPC2126316' [AC5]>, Freq 2412 MHz, Rate 54 Mb/s, Strength 57 WPA WPA2
Haiti3D: Infra, <MAC 'Haiti3D' [AC10]>, Freq 2437 MHz, Rate 54 Mb/s, Strength 47 WPA WPA2
ThomsonE579A7: Infra, <MAC 'ThomsonE579A7' [AN13]>, Freq 2437 MHz, Rate 54 Mb/s, Strength 54
IPv4 Settings:
Address: 10.0.0.26
Prefix: 24 (255.255.255.0)
Gateway: 10.0.0.138
DNS: 10.0.0.138
##### 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/WLAN am See]] (600 root)
[connection] id=WLAN am See | type=802-11-wireless
[802-11-wireless] ssid=WLAN am See | mac-address=<MAC 'wlan0' [IF]>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/WichtelLAN]] (600 root)
[connection] id=WichtelLAN | type=802-11-wireless
[802-11-wireless] ssid=WichtelLAN | mac-address=<MAC 'wlan0' [IF]>
[ipv4] method=auto
[ipv6] method=auto
答案1
我会先这样做
echo "options rtl8723be fwlps=0 swlps=0" | sudo tee /etc/modprobe.d/rtl8723be.conf
重新启动并查看是否有效