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hg206
May 1st, 2009, 10:51 AM
I have been using my Dell laptop with Ubuntu 8.04 for several months now. No problems until 2 days ago when the wifi stopped working.

It's not a problem with the router, as I'm posting this with my other laptop running Windows XP, and the wireless connection works fine.

I think the problem is with the wireless being "disabled by HW RF Kill switch", but I don't know how to solve this problem. Please help!

Here's more info:

1 ) Machine Brand and Model (PC/Laptop)

Dell Inspiron 1525 Laptop


2 ) Wireless Brand, Model and Wireless Chipset:

heng@dell-desktop:~$ lspci | grep -i 'wireless'
0b:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG Network Connection (rev 02)


3 ) check interface:

heng@dell-desktop:~$ iwconfig
lo no wireless extensions.

eth0 no wireless extensions.

wmaster0 no wireless extensions.

wlan0 IEEE 802.11abg ESSID:""
Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated
Tx-Power=0 dBm
Retry min limit:7 RTS thr:off Fragment thr=2352 B
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

ppp0 no wireless extensions.


4 ) Check for modules:

heng@dell-desktop:~$ lsmod | grep 'iwl'
iwl3945 96244 0
lbm_iwl_mac80211 242292 1 iwl3945
rfkill 8596 2 iwl3945
led_class 6020 1 iwl3945
lbm_iwl_cfg80211 33248 2 iwl3945,lbm_iwl_mac80211


5 ) Kernel boot messages

heng@dell-desktop:~$ dmesg | grep 'iwl'
[ 23.921723] iwl3945: Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux, 1.2.26k
[ 23.921727] iwl3945: Copyright(c) 2003-2008 Intel Corporation
[ 25.932766] iwl3945: Detected Intel Wireless WiFi Link 3945ABG
[ 26.019336] iwl3945: Tunable channels: 13 802.11bg, 23 802.11a channels
[ 26.020495] phy0: Selected rate control algorithm 'iwl-3945-rs'
[ 33.729904] iwl3945: Radio disabled by HW RF Kill switch


6 ) Network configuration

heng@dell-desktop:~$ sudo lshw -C network
[sudo] password for heng:
*-network
description: Ethernet interface
product: 88E8040 PCI-E Fast Ethernet Controller
vendor: Marvell Technology Group Ltd.
physical id: 0
bus info: pci@0000:09:00.0
logical name: eth0
version: 12
serial: 00:21:9b:cc:e5:39
capacity: 100MB/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=sky2 driverversion=1.20 firmware=N/A latency=0 link=no module=sky2 multicast=yes port=twisted pair
*-network DISABLED
description: Wireless interface
product: PRO/Wireless 3945ABG Network Connection
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:0b:00.0
logical name: wmaster0
version: 02
serial: 00:1f:3c:86:db:6c
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress cap_list logical ethernet physical wireless
configuration: broadcast=yes driver=iwl3945 latency=0 module=iwl3945 multicast=yes wireless=IEEE 802.11abg


7 ) Network configuration:

heng@dell-desktop:~$ iwlist scan
lo Interface doesn't support scanning.

eth0 Interface doesn't support scanning.

wmaster0 Interface doesn't support scanning.

wlan0 No scan results



8 ) Ubuntu Version:

heng@dell-desktop:~$ lsb_release -d
Description: Ubuntu 8.04.2


9 ) Kernel/architecture:

heng@dell-desktop:~$ uname -mr
2.6.24-23-generic i686


10 ) Restarting the network:

heng@dell-desktop:~$ sudo /etc/init.d/networking restart
* Reconfiguring network interfaces... [ OK ]

chili555
May 1st, 2009, 12:26 PM
iwl3945: Radio disabled by HW RF Kill switch Somewhere on your laptop, there is a switch or key combination that enables or disables the wireless radio. It has become nudged over to 'off.'

Switch it back on and you should be all set!

hg206
May 1st, 2009, 01:37 PM
Found the switch - didn't even know it was there! Feel like an idiot!

Re-connected to wifi now, finally! Thanks so much for your help!

speedwell68
May 7th, 2009, 12:52 PM
Somewhere on your laptop, there is a switch or key combination that enables or disables the wireless radio. It has become nudged over to 'off.'

Switch it back on and you should be all set!


Found the switch - didn't even know it was there! Feel like an idiot!

Re-connected to wifi now, finally! Thanks so much for your help!

My friend has recently had a very nasty virus attack in Vista and wanted me to install Linux instead. So I installed Jaunty, his wireless didn't work. I have spent all morning trying all sorts fancy ways of getting this card to work and then I read this thread, found the switch and all was well. So thanks for that, the simplest fix is usually the best one.:D