I'm having a problem with my [USB] Wi-Fi connection in Ubuntu 14.04.4, it keeps dropping after every few minutes and I then need to restart my laptop to connect again. My phone connects well to the network so it shouldn't be a network issue.
I typed lshw -C network and received the following:
root@ninas-Lenovo-U31-70:/home/nina# lshw -C network
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
logical name: eth0
version: 15
serial: f0:76:1c:fc:09:28
size: 10Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168h-2_0.0.2 02/26/15 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:48 ioport:4000(size=256) memory:c4404000-c4404fff memory:c4400000-c4403fff
*-network UNCLAIMED
description: Network controller
product: QCA6164 802.11ac Wireless Network Adapter
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:03:00.0
version: 20
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress cap_list
configuration: latency=0
resources: memory:c4200000-c43fffff
*-network
description: Wireless interface
physical id: 3
bus info: usb@1:2
logical name: wlan0
serial: 8c:ae:4c:f8:3c:36
capabilities: ethernet physical wireless
configuration: broadcast=yes driver=rtl8192cu driverversion=4.2.0-27-generic firmware=N/A ip=192.168.0.21 link=yes multicast=yes wireless=IEEE 802.11bgn
I also ran the following script
wget -N -t 5 -T 10 https://github.com/UbuntuForums/wireless-info/raw/master/wireless-info && chmod +x wireless-info && ./wireless-info
It returns the following information.
########## wireless info START ##########
Report from: 30 Mar 2016 17:15 BST +0100
Booted last: 30 Mar 2016 17:15 BST +0100
Script from: 27 Sep 2015 00:34 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 14.04.4 LTS
Release: 14.04
Codename: trusty
##### kernel ############################
Linux 4.2.0-27-generic #32~14.04.1-Ubuntu SMP Fri Jan 22 15:32:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 15)
Subsystem: Lenovo Device [17aa:3828]
Kernel driver in use: r8169
03:00.0 Network controller [0280]: Qualcomm Atheros QCA6164 802.11ac Wireless Network Adapter [168c:0041] (rev 20)
Subsystem: Lenovo Device [17aa:3545]
04:00.0 3D controller [0302]: NVIDIA Corporation GK208M [GeForce 920M] [10de:1299] (rev a1)
##### lsusb #############################
Bus 003 Device 002: ID 8087:8001 Intel Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 0cf3:e300 Atheros Communications, Inc.
Bus 001 Device 003: ID 5986:0670 Acer, Inc
Bus 001 Device 002: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 005: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter
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 #############################
rtl8192cu 69632 0
rtl_usb 20480 1 rtl8192cu
rtl8192c_common 49152 1 rtl8192cu
rtlwifi 77824 3 rtl_usb,rtl8192c_common,rtl8192cu
mac80211 729088 3 rtl_usb,rtlwifi,rtl8192cu
cfg80211 540672 2 mac80211,rtlwifi
mxm_wmi 16384 1 nouveau
snd_soc_rt286 40960 0
snd_soc_rl6347a 16384 1 snd_soc_rt286
snd_soc_core 200704 1 snd_soc_rt286
snd_pcm 102400 7 snd_soc_core,snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_soc_rt286,snd_pcm_dmaengine,snd_hda_core
ideapad_laptop 24576 0
sparse_keymap 16384 1 ideapad_laptop
wmi 20480 2 mxm_wmi,nouveau
video 36864 3 i915,ideapad_laptop,nouveau
##### interfaces ########################
auto lo
iface lo inet loopback
##### ifconfig ##########################
eth0 Link encap:Ethernet HWaddr
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
inet addr:192.168.0.21 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:65 errors:0 dropped:0 overruns:0 frame:0
TX packets:107 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:33127 (33.1 KB) TX bytes:16663 (16.6 KB)
##### iwconfig ##########################
eth0 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"SKY72199"
Mode:Managed Frequency:2.462 GHz Access Point:
Bit Rate=72.2 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
Link Quality=50/70 Signal level=-60 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:5 Missed beacon:0
##### route #############################
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 wlan0
192.168.0.0 0.0.0.0 255.255.255.0 U 9 0 0 wlan0
##### resolv.conf #######################
nameserver 127.0.1.1
search Home
##### network managers ##################
Installed:
NetworkManager
Running:
root 784 1 1 17:15 ? 00:00:00 NetworkManager
##### NetworkManager info ###############
NetworkManager Tool
State: connected (global)
- Device: wlan0 [SKY72199] ----------------------------------------------------
Type: 802.11 WiFi
Driver: rtl8192cu
State: connected
Default: yes
HW Address:
Capabilities:
Speed: 72 Mb/s
Wireless Properties
WEP Encryption: yes
WPA Encryption: yes
WPA2 Encryption: yes
Wireless Access Points (* = current AP)
BTWifi-X: Infra, , Freq 2412 MHz, Rate 54 Mb/s, Strength 70 WPA WPA2 Enterprise
BTHub5-238J: Infra, , Freq 2412 MHz, Rate 54 Mb/s, Strength 70 WPA2
SKYF5CEA: Infra, , Freq 2442 MHz, Rate 54 Mb/s, Strength 70 WPA2
TALKTALK997CB1: Infra, , Freq 2422 MHz, Rate 54 Mb/s, Strength 67 WPA WPA2
TALKTALK-2B3F5A: Infra, , Freq 2462 MHz, Rate 54 Mb/s, Strength 47 WPA WPA2
BTWifi-with-FON: Infra, , Freq 2412 MHz, Rate 54 Mb/s, Strength 70
*SKY72199: Infra, , Freq 2462 MHz, Rate 54 Mb/s, Strength 81 WPA2
IPv4 Settings:
Address: 192.168.0.21
Prefix: 24 (255.255.255.0)
Gateway: 192.168.0.1
DNS: 192.168.0.1
- Device: eth0 -----------------------------------------------------------------
Type: Wired
Driver: r8169
State: unavailable
Default: no
HW Address:
Capabilities:
Carrier Detect: yes
Wired Properties
Carrier: off
##### 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 ###########
Acquisition of admin privileges failed.
##### iw reg get ########################
Region: Europe/London (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.
lo no frequency information.
wlan0 13 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
Channel 12 : 2.467 GHz
Channel 13 : 2.472 GHz
Current Frequency:2.462 GHz (Channel 11)
##### iwlist scan #######################
Sorry, try again.
Sorry, try again.
Sorry, try again.
sudo: 3 incorrect password attempts
Acquisition of admin privileges failed.
##### module infos ######################
[rtl8192cu]
filename: /lib/modules/4.2.0-27-generic/kernel/drivers/net/wireless/rtlwifi/rtl8192cu/rtl8192cu.ko
firmware: rtlwifi/rtl8192cufw_TMSC.bin
firmware: rtlwifi/rtl8192cufw_B.bin
firmware: rtlwifi/rtl8192cufw_A.bin
firmware: rtlwifi/rtl8192cufw.bin
description: Realtek 8192C/8188C 802.11n USB wireless
license: GPL
author: Larry Finger
author: Ziv Huang
author: Georgia
srcversion: 730D20DBF46D54850A5E8F4
depends: rtlwifi,rtl8192c-common,rtl_usb,mac80211
intree: Y
vermagic: 4.2.0-27-generic SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: 73:6E:2F:9E:A1:B4:72:8A:15:AC:16:9B:18:69:26:7E:11:28:D6:E8
sig_hashalgo: sha512
parm: swenc:Set to 1 for software crypto (default 0)
(bool)
parm: debug:Set debug level (0-5) (default 0) (int)
[rtl_usb]
filename: /lib/modules/4.2.0-27-generic/kernel/drivers/net/wireless/rtlwifi/rtl_usb.ko
description: USB basic driver for rtlwifi
license: GPL
author: Larry Finger
author: Realtek WlanFAE
author: lizhaoming
srcversion: E2BFFC8F9C4C5753F88B5D5
depends: rtlwifi,mac80211
intree: Y
vermagic: 4.2.0-27-generic SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: 73:6E:2F:9E:A1:B4:72:8A:15:AC:16:9B:18:69:26:7E:11:28:D6:E8
sig_hashalgo: sha512
[rtl8192c_common]
filename: /lib/modules/4.2.0-27-generic/kernel/drivers/net/wireless/rtlwifi/rtl8192c/rtl8192c-common.ko
description: Realtek 8192C/8188C 802.11n PCI wireless
license: GPL
author: Larry Finger
author: Ziv Huang
author: Georgia
author: Realtek WlanFAE
author: lizhaoming
srcversion: 1ED716BB42196D4EBC16CBE
depends: rtlwifi
intree: Y
vermagic: 4.2.0-27-generic SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: 73:6E:2F:9E:A1:B4:72:8A:15:AC:16:9B:18:69:26:7E:11:28:D6:E8
sig_hashalgo: sha512
[rtlwifi]
filename: /lib/modules/4.2.0-27-generic/kernel/drivers/net/wireless/rtlwifi/rtlwifi.ko
description: Realtek 802.11n PCI wireless core
license: GPL
author: Larry Finger
author: Realtek WlanFAE
author: lizhaoming
srcversion: F4CACC5FCAEBE7C22930A24
depends: mac80211,cfg80211
intree: Y
vermagic: 4.2.0-27-generic SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: 73:6E:2F:9E:A1:B4:72:8A:15:AC:16:9B:18:69:26:7E:11:28:D6:E8
sig_hashalgo: sha512
[mac80211]
filename: /lib/modules/4.2.0-27-generic/kernel/net/mac80211/mac80211.ko
license: GPL
description: IEEE 802.11 subsystem
srcversion: FBF6EA073A00B4F3836226E
depends: cfg80211
intree: Y
vermagic: 4.2.0-27-generic SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: 73:6E:2F:9E:A1:B4:72:8A:15:AC:16:9B:18:69:26:7E:11:28:D6:E8
sig_hashalgo: sha512
parm: minstrel_vht_only:Use only VHT rates when VHT is supported by sta. (bool)
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/4.2.0-27-generic/kernel/net/wireless/cfg80211.ko
description: wireless configuration support
license: GPL
author: Johannes Berg
srcversion: 7982686FBE8064A87E02753
depends:
intree: Y
vermagic: 4.2.0-27-generic SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: 73:6E:2F:9E:A1:B4:72:8A:15:AC:16:9B:18:69:26:7E:11:28:D6:E8
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 #################
[rtl8192cu]
debug: 0
swenc: N
[mac80211]
beacon_loss_count: 7
ieee80211_default_rc_algo: minstrel_ht
max_nullfunc_tries: 2
max_probe_tries: 5
minstrel_vht_only: Y
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
##### 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}=="", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# USB device 0x:0x (rtl8192cu)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"
##### dmesg #############################
[ 28.195338] rtl8192cu: Chip version 0x10
[ 28.223553] rtl8192cu: MAC address:
[ 28.223555] rtl8192cu: Board Type 0
[ 28.223630] rtl_usb: rx_max_size 15360, rx_urb_num 8, in_ep 1
[ 28.223665] rtl8192cu: Loading firmware rtlwifi/rtl8192cufw_TMSC.bin
[ 28.226877] ieee80211 phy0: Selected rate control algorithm 'rtl_rc'
[ 28.232078] rtl8192cu: MAC auto ON okay!
[ 28.248384] rtl8192cu: Tx queue select: 0x05
[ 28.627747] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 29.519562] wlan0: authenticate with
[ 29.530232] wlan0: send auth to (try 1/3)
[ 29.546920] wlan0: authenticated
[ 29.549649] wlan0: associate with (try 1/3)
[ 29.570911] wlan0: RX AssocResp from (capab=0x411 status=0 aid=4)
[ 29.571740] wlan0: associated
[ 29.571750] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
########## wireless info END ############
Does anyone see what the problem is? Please tell me if you need more information.
