Randomely loosing wireless connexion with Cubuntu 12.04
- by statquant
I am presently experiencing random disconnections from my wireless network.
It looks like it is more and more frequent (however I have not seen any clear pattern).
This is killing me...
Here is some information that should help (from ubuntu forums).
Thanks for reading
Machine : Acer Aspire S3
statquant@euclide:~$ lsb_release -d
Description: Ubuntu 12.04.1 LTS
statquant@euclide:~$ uname -mr
3.2.0-33-generic x86_64
statquant@euclide:~$ sudo /etc/init.d/networking restart
* Running /etc/init.d/networking restart is deprecated because it may not enable again some interfaces
* Reconfiguring network interfaces...
statquant@euclide:~$ lspci
02:00.0 Network controller: Atheros Communications Inc. AR9485 Wireless Network Adapter (rev 01)
statquant@euclide:~$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 004: ID 064e:c321 Suyin Corp.
Bus 002 Device 003: ID 0bda:0129 Realtek Semiconductor Corp.
statquant@euclide:~$ ifconfig
wlan0 Link encap:Ethernet HWaddr 74:de:2b:dd:c4:78
inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::76de:2bff:fedd:c478/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:913 errors:0 dropped:0 overruns:0 frame:0
TX packets:802 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:873218 (873.2 KB) TX bytes:125826 (125.8 KB)
statquant@euclide:~$ iwconfig
wlan0 IEEE 802.11bgn ESSID:"Bbox-D646D1"
Mode:Managed Frequency:2.437 GHz Access Point: 00:19:70:80:01:6C
Bit Rate=65 Mb/s Tx-Power=16 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=56/70 Signal level=-54 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:71 Missed beacon:0
statquant@euclide:~$ dmesg | grep "wlan"
[ 17.495866] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 17.498950] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 20.072015] wlan0: authenticate with 00:19:70:80:01:6c (try 1)
[ 20.269853] wlan0: authenticate with 00:19:70:80:01:6c (try 2)
[ 20.272386] wlan0: authenticated
[ 20.298682] wlan0: associate with 00:19:70:80:01:6c (try 1)
[ 20.302321] wlan0: RX AssocResp from 00:19:70:80:01:6c (capab=0x431 status=0 aid=1)
[ 20.302325] wlan0: associated
[ 20.307307] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 30.402292] wlan0: no IPv6 routers present
statquant@euclide:~$ sudo lshw -C network
[sudo] password for statquant:
*-network
description: Wireless interface
product: AR9485 Wireless Network Adapter
vendor: Atheros Communications Inc.
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlan0
version: 01
serial: 74:de:2b:dd:c4:78
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
configuration: broadcast=yes driver=ath9k driverversion=3.2.0-33-generic firmware=N/A ip=192.168.1.3 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
resources: irq:17 memory:c0400000-c047ffff memory:afb00000-afb0ffff
statquant@euclide:~$ iwlist scan
wlan0 Scan completed :
Cell 01 - Address: 00:19:70:80:01:6C
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=56/70 Signal level=-54 dBm
Encryption key:on
ESSID:"Bbox-D646D1"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 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=000000125fb152bb
Extra: Last beacon: 40020ms ago
IE: Unknown: 000B42626F782D443634364431
IE: Unknown: 010882848B960C121824
IE: Unknown: 030106
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: Unknown: 2A0100
IE: Unknown: 32043048606C
IE: Unknown: DD180050F2020101820003A4000027A4000042435E0062322F00
IE: Unknown: 2D1A4C101BFF00000000000000000000000000000000000000000000
IE: Unknown: 3D1606080800000000000000000000000000000000000000
IE: Unknown: DD0900037F01010000FF7F
IE: Unknown: DD0A00037F04010000000000
And... finally, please note that I did the following (after looking for fixes of similar problems), but unfortunately it did not work
sudo modprobe -r iwlwifi
sudo modprobe iwlwifi 11n_disable=1
