Estou usando o Ubuntu 14.04, instalei o driver rtl8723be e o WiFi funcionou bem por alguns meses, mas depois ele parou de responder depois de um tempo (pode ser por cerca de 5 minutos).
Eu segui a primeira solução no este link para corrigir o problema. Quando eu reiniciei o meu sistema, a opção "conexão sem fio" desapareceu nas configurações de rede. Eu tentei a primeira solução em este link, mas não não ajude nenhum dos dois.
Isso pode ser útil:
########## wireless info START ##########
Report from: 11 Nov 2015 12:57 IST +0530
Booted last: 11 Nov 2015 00:50 IST +0530
Script from: 27 Sep 2015 00:34 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty
##### kernel ############################
Linux 4.1.0-rc7+ #5 SMP Wed Sep 2 09:06:11 IST 2015 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
01:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 10)
Subsystem: Lenovo Device [17aa:380b]
Kernel driver in use: r8169
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
Subsystem: Lenovo Device [17aa:b736]
##### lsusb #############################
Bus 001 Device 002: ID 8087:8000 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 004: ID 0bda:b728 Realtek Semiconductor Corp.
Bus 002 Device 003: ID 5986:055e Acer, Inc
Bus 002 Device 002: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### dkms status #######################
rtl8723au_bt, 0.7.1~trusty, 4.1.0-rc7+, x86_64: installed
rtlwifi-new, 0.5~trusty, 4.1.0-rc7+, x86_64: installed
##### rfkill ############################
1: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
2: ideapad_bluetooth: Bluetooth
Soft blocked: yes
Hard blocked: no
3: hci0: Bluetooth
Soft blocked: yes
Hard blocked: no
##### lsmod #############################
mac80211 741376 0
snd_soc_rt5640 94208 0
snd_soc_rl6231 16384 1 snd_soc_rt5640
snd_soc_core 196608 1 snd_soc_rt5640
cfg80211 552960 1 mac80211
snd_pcm 106496 7 snd_soc_rt5640,snd_soc_core,snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller,snd_pcm_dmaengine
ideapad_laptop 20480 0
sparse_keymap 16384 1 ideapad_laptop
##### interfaces ########################
auto lo
iface lo inet loopback
##### ifconfig ##########################
eth0 Link encap:Ethernet HWaddr <MAC 'eth0' [IF]>
inet addr:192.168.1.4 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::<IP6 'eth0' [IF]>/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:16552 errors:0 dropped:0 overruns:0 frame:0
TX packets:14631 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:14487680 (14.4 MB) TX bytes:1729997 (1.7 MB)
virbr0 Link encap:Ethernet HWaddr <MAC 'virbr0' [IF]>
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
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:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
##### iwconfig ##########################
eth0 no wireless extensions.
virbr0 no wireless extensions.
lo no wireless extensions.
##### route #############################
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
##### resolv.conf #######################
nameserver 127.0.1.1
search Home
##### network managers ##################
Installed:
NetworkManager
Running:
root 907 1 0 00:50 ? 00:00:00 NetworkManager
##### NetworkManager info ###############
NetworkManager Tool
State: connected (global)
- Device: <MAC address> ----------------------------------------------------
Type: Bluetooth
Driver: bluez
State: disconnected
Default: no
Capabilities:
- Device: eth0 [Ethernet connection 1] ----------------------------------------
Type: Wired
Driver: r8169
State: connected
Default: yes
HW Address: <MAC 'eth0' [IF]>
Capabilities:
Carrier Detect: yes
Speed: 100 Mb/s
Wired Properties
Carrier: on
IPv4 Settings:
Address: 192.168.1.4
Prefix: 24 (255.255.255.0)
Gateway: 192.168.1.1
DNS: 192.168.1.1
##### 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/BCFC-c3M]] (600 root)
[connection] id=BCFC-c3M | type=802-11-wireless
[802-11-wireless] ssid=BCFC-c3M | mac-address=<MAC address>
[ipv6] method=auto
[ipv4] method=auto
[[/etc/NetworkManager/system-connections/No-Network]] (600 root)
[connection] id=No-Network | type=802-11-wireless
[802-11-wireless] ssid=No-Network | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/praneetha]] (600 root)
[connection] id=praneetha | type=802-11-wireless
[802-11-wireless] ssid=praneetha | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/vindhya@iiith]] (600 root)
[connection] id=vindhya@iiith | type=802-11-wireless
[802-11-wireless] ssid=vindhya@iiith | mac-address=<MAC address>
[ipv6] method=auto
[ipv4] method=auto
[[/etc/NetworkManager/system-connections/Computer Planet]] (600 root)
[connection] id=Computer Planet | type=802-11-wireless
[802-11-wireless] ssid=Computer Planet | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/nilgiri@iiith]] (600 root)
[connection] id=nilgiri@iiith | type=802-11-wireless
[802-11-wireless] ssid=nilgiri@iiith | mac-address=<MAC address>
[ipv6] method=auto
[ipv4] method=auto
[[/etc/NetworkManager/system-connections/Pal.]] (600 root)
[connection] id=Pal. | type=802-11-wireless
[802-11-wireless] ssid=Pal. | mac-address=<MAC address>
[ipv6] method=auto
[ipv4] method=auto
[[/etc/NetworkManager/system-connections/vindhya@iiith 1]] (600 root)
[connection] id=vindhya@iiith 1 | type=802-11-wireless
[802-11-wireless] ssid=vindhya@iiith | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/Nilgiri3-5]] (600 root)
[connection] id=Nilgiri3-5 | type=802-11-wireless
[802-11-wireless] ssid=Nilgiri3-5 | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/shrutigupta 1]] (600 root)
[connection] id=shrutigupta 1 | type=802-11-wireless
[802-11-wireless] ssid=shrutigupta | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/Nuts-Hotspot]] (600 root)
[connection] id=Nuts-Hotspot | type=802-11-wireless
[802-11-wireless] ssid=Nuts-Hotspot | mac-address=<MAC address>
[ipv6] method=auto
[ipv4] method=auto
[[/etc/NetworkManager/system-connections/pathak]] (600 root)
[connection] id=pathak | type=802-11-wireless
[802-11-wireless] ssid=pathak | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/VindhyaOAP1]] (600 root)
[connection] id=VindhyaOAP1 | type=802-11-wireless
[802-11-wireless] ssid=VindhyaOAP1 | mac-address=<MAC address>
[ipv6] method=auto
[ipv4] method=auto
[[/etc/NetworkManager/system-connections/nilgiri@iiith 1]] (600 root)
[connection] id=nilgiri@iiith 1 | type=802-11-wireless
[802-11-wireless] ssid=nilgiri@iiith | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/susanth]] (600 root)
[connection] id=susanth | type=802-11-wireless
[802-11-wireless] ssid=susanth | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/belkin.eb8]] (600 root)
[connection] id=belkin.eb8 | type=802-11-wireless
[802-11-wireless] ssid=belkin.eb8 | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/Himalaya@iiith]] (600 root)
[connection] id=Himalaya@iiith | type=802-11-wireless
[802-11-wireless] ssid=Himalaya@iiith | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/BPS]] (600 root)
[connection] id=BPS | type=802-11-wireless
[802-11-wireless] ssid=BPS | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/shrutigupta]] (600 root)
[connection] id=shrutigupta | type=802-11-wireless
[802-11-wireless] ssid=shrutigupta | mac-address=<MAC address>
[ipv6] method=auto
[ipv4] method=auto
[[/etc/NetworkManager/system-connections/Atlantis]] (600 root)
[connection] id=Atlantis | type=802-11-wireless
[802-11-wireless] ssid=Atlantis | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/belkin.116]] (600 root)
[connection] id=belkin.116 | type=802-11-wireless
[802-11-wireless] ssid=belkin.116 | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/manasawifi]] (600 root)
[connection] id=manasawifi | type=802-11-wireless
[802-11-wireless] ssid=manasawifi | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/MSIT]] (600 root)
[connection] id=MSIT | type=802-11-wireless
[802-11-wireless] ssid=MSIT | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/BCFC-c3M 1]] (600 root)
[connection] id=BCFC-c3M 1 | type=802-11-wireless
[802-11-wireless] ssid=BCFC-c3M | mac-address=<MAC address>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/Sritej Kamishetty’s MacBook Pr]] (600 root)
[connection] id=Sritej Kamishetty’s MacBook Pr | type=802-11-wireless
[802-11-wireless] ssid=83;114;105;116;101;106;32;75;97;109;105;115;104;101;116;116;121;226;128;153;115;32;77;97;99;66;111;111;107;32;80;114; | mac-address=<MAC address>
[ipv6] method=auto
[ipv4] method=auto
##### iw reg get ########################
Region: Asia/Kolkata (based on set time zone)
country 00:
(2402 - 2472 @ 40), (3, 20)
(2457 - 2482 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
(2474 - 2494 @ 20), (3, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
(5170 - 5250 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
(5735 - 5835 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
##### iwlist channels ###################
eth0 no frequency information.
virbr0 no frequency information.
lo no frequency information.
##### iwlist scan #######################
eth0 Interface doesn't support scanning.
virbr0 Interface doesn't support scanning.
lo Interface doesn't support scanning.
##### module infos ######################
[mac80211]
filename: /lib/modules/4.1.0-rc7+/kernel/net/mac80211/mac80211.ko
license: GPL
description: IEEE 802.11 subsystem
srcversion: 5F217E3E605BFE2A9C4566D
depends: cfg80211
intree: Y
vermagic: 4.1.0-rc7+ SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: 31:7F:06:38:62:DB:A9:43:7C:B4:DB:30:73:A7:36:B2:39:64:6D:25
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/4.1.0-rc7+/kernel/net/wireless/cfg80211.ko
description: wireless configuration support
license: GPL
author: Johannes Berg
srcversion: 589E4A864ED1FA35C9018BE
depends:
intree: Y
vermagic: 4.1.0-rc7+ SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: 31:7F:06:38:62:DB:A9:43:7C:B4:DB:30:73:A7:36:B2:39:64:6D:25
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 #################
[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/qemu-system-x86.conf]
options kvm_intel nested=1
[/etc/modprobe.d/rtl8723be.conf]
options rtl8723be fwlps=N ips=N
##### 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"
##### dmesg #############################
[ 72.239947] r8169 0000:01:00.0 eth0: link up
[ 72.239957] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 421.969500] r8169 0000:01:00.0 eth0: rtl_eriar_cond == 1 (loop: 100, delay: 100).
[ 424.735891] Bluetooth: hci0: rtl: examining hci_ver=06 hci_rev=000b lmp_ver=06 lmp_subver=8723
[ 424.735896] Bluetooth: hci0: rtl: loading rtl_bt/rtl8723b_fw.bin
[ 427.399529] r8169 0000:01:00.0 eth0: link down
[ 427.399576] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 429.000414] r8169 0000:01:00.0 eth0: link up
[ 429.000422] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 433.205928] r8169 0000:01:00.0 eth0: link down
[ 434.849920] r8169 0000:01:00.0 eth0: link up
########## wireless info END ############
Obrigado antecipadamente.
Primeiro de tudo, você tem um kernel não suportado 4.1.0-rc7 +.
Sugiro remover os drivers primeiro executando:
sudo apt-get remove rtlwifi-new-dkms rtl8723au-bt-dkms
Em seguida, instale um kernel suportado 4.2 executando
sudo apt-get install linux-generic-lts-wily
Provavelmente, o Wi-Fi funcionará bem após a reinicialização. Caso contrário, tente instalar rtlwifi-new-dkms .