Network controller [0280]: Intel Corporation Wireless WiFi Link 5100 [8086:4232] can detect 1 wireless network, but cannot connect to it on an Acer 5735 laptop in Ubuntu 9.04

Wireless was working perfectly while away from home but doesn't work on return. LAN OK. Read this thread:-

Mark Rijckenberg said on 2009-05-22:

Hi,

Please first connect your network card to the wireless router using an ethernet cable (also known as a LAN cable).

In order to gather essential troubleshooting information about your wireless card, please follow this procedure:

Step 1: Open Terminal from "Applications->Accessories->
Terminal"

Step 2: Run the following commands (copy-paste each line below to the Terminal then hit <enter> after each line)

cat /etc/lsb-release
sudo iwlist scanning
sudo lshw -C network
lspci -nn
lsusb
uname -a
dmesg | grep ound
iwconfig

Step 3: Please post results (copy/paste terminal output from each command) on this thread

Keep in mind that one or more of the following 5 basic components need to be configured correctly so that wireless can work correctly in Linux:

Wireless configuration in the BIOS, hardware wireless switch setting, active wireless driver version, the firmware for the wireless chipset (stored as a file in Linux), and the configuration of the wireless parameters in wicd or NetworkManager (SSID broadcast settings, encryption settings, name of wireless interface stored in wicd, the chosen channel for wireless transmission, ...) .

Regards,

Mark

My Terminal print after following Mark's instructions is:-
ray@RayLaptop:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=9.04
DISTRIB_CODENAME=jaunty
DISTRIB_DESCRIPTION="Ubuntu 9.04"
ray@RayLaptop:~$ sudo iwlist scanning
[sudo] password for ray:
lo Interface doesn't support scanning.

eth0 Interface doesn't support scanning.

wmaster0 Interface doesn't support scanning.

wlan0 Scan completed :
          Cell 01 - Address: 00:1B:2F:DE:7D:30
                    ESSID:"ARDIANET"
                    Mode:Master
                    Channel:11
                    Frequency:2.462 GHz (Channel 11)
                    Quality=100/100 Signal level:-16 dBm Noise level=-127 dBm
                    Encryption key:off
                    IE: Unknown: 000841524449414E4554
                    IE: Unknown: 010882848B960C183048
                    IE: Unknown: 03010B
                    IE: Unknown: 2A0100
                    IE: Unknown: 32041224606C
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              12 Mb/s; 24 Mb/s; 36 Mb/s; 9 Mb/s; 18 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:tsf=000000762a960181
                    Extra: Last beacon: 32ms ago

pan0 Interface doesn't support scanning.

ray@RayLaptop:~$ sudo lshw -C network
  *-network
       description: Ethernet interface
       product: 88E8071 PCI-E Gigabit Ethernet Controller
       vendor: Marvell Technology Group Ltd.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: eth0
       version: 16
       serial: 00:1d:72:dd:6e:79
       size: 100MB/s
       capacity: 1GB/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=sky2 driverversion=1.22 duplex=full firmware=N/A ip=10.0.0.2 latency=0 link=yes module=sky2 multicast=yes port=twisted pair speed=100MB/s
  *-network
       description: Wireless interface
       product: Wireless WiFi Link 5100
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wmaster0
       version: 00
       serial: 00:21:5d:78:fb:62
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list logical ethernet physical wireless
       configuration: broadcast=yes driver=iwlagn latency=0 module=iwlagn multicast=yes wireless=IEEE 802.11abgn
  *-network DISABLED
       description: Ethernet interface
       physical id: 3
       logical name: pan0
       serial: 82:46:bb:2a:c9:87
       capabilities: ethernet physical
       configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A link=yes multicast=yes
ray@RayLaptop:~$ sudo lshw -C network
  *-network
       description: Ethernet interface
       product: 88E8071 PCI-E Gigabit Ethernet Controller
       vendor: Marvell Technology Group Ltd.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: eth0
       version: 16
       serial: 00:1d:72:dd:6e:79
       size: 100MB/s
       capacity: 1GB/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=sky2 driverversion=1.22 duplex=full firmware=N/A ip=10.0.0.2 latency=0 link=yes module=sky2 multicast=yes port=twisted pair speed=100MB/s
  *-network
       description: Wireless interface
       product: Wireless WiFi Link 5100
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wmaster0
       version: 00
       serial: 00:21:5d:78:fb:62
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list logical ethernet physical wireless
       configuration: broadcast=yes driver=iwlagn latency=0 module=iwlagn multicast=yes wireless=IEEE 802.11abgn
  *-network DISABLED
       description: Ethernet interface
       physical id: 3
       logical name: pan0
       serial: 82:46:bb:2a:c9:87
       capabilities: ethernet physical
       configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A link=yes multicast=yes
ray@RayLaptop:~$ lspci -nn
00:00.0 Host bridge [0600]: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub [8086:2a40] (rev 07)
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07)
00:02.1 Display controller [0380]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a43] (rev 07)
00:1a.0 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 [8086:2937] (rev 03)
00:1a.1 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 [8086:2938] (rev 03)
00:1a.2 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 [8086:2939] (rev 03)
00:1a.7 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 [8086:293c] (rev 03)
00:1b.0 Audio device [0403]: Intel Corporation 82801I (ICH9 Family) HD Audio Controller [8086:293e] (rev 03)
00:1c.0 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 [8086:2940] (rev 03)
00:1c.1 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 [8086:2942] (rev 03)
00:1c.2 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 [8086:2944] (rev 03)
00:1c.3 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 4 [8086:2946] (rev 03)
00:1c.4 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5 [8086:2948] (rev 03)
00:1d.0 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 [8086:2934] (rev 03)
00:1d.1 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 [8086:2935] (rev 03)
00:1d.2 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 [8086:2936] (rev 03)
00:1d.7 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 [8086:293a] (rev 03)
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobile PCI Bridge [8086:2448] (rev 93)
00:1f.0 ISA bridge [0601]: Intel Corporation ICH9M LPC Interface Controller [8086:2919] (rev 03)
00:1f.2 SATA controller [0106]: Intel Corporation ICH9M/M-E SATA AHCI Controller [8086:2929] (rev 03)
00:1f.3 SMBus [0c05]: Intel Corporation 82801I (ICH9 Family) SMBus Controller [8086:2930] (rev 03)
02:00.0 Ethernet controller [0200]: Marvell Technology Group Ltd. 88E8071 PCI-E Gigabit Ethernet Controller [11ab:436b] (rev 16)
03:00.0 Network controller [0280]: Intel Corporation Wireless WiFi Link 5100 [8086:4232]
ray@RayLaptop:~$ lsusb
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 003: ID 0461:4d2b Primax Electronics, Ltd Wireless Laser Mini Mouse (HID)
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 0bda:0158 Realtek Semiconductor Corp. Mass Stroage Device
Bus 001 Device 002: ID 064e:a103 Suyin Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
ray@RayLaptop:~$ uname -a
Linux RayLaptop 2.6.28-14-generic #47-Ubuntu SMP Sat Jul 25 00:28:35 UTC 2009 i686 GNU/Linux
ray@RayLaptop:~$ dmesg | grep ound
[ 0.000000] Phoenix BIOS detected: BIOS may corrupt low RAM, working it around.
[ 0.000000] found SMP MP-table at [c00f7310] 000f7310
[ 0.876944] ACPI: No dock devices found.
[ 0.939895] pnp: PnP ACPI: found 10 devices
[ 4.905553] pcieport-driver 0000:00:1c.0: found MSI capability
[ 4.905820] pcieport-driver 0000:00:1c.1: found MSI capability
[ 4.906070] pcieport-driver 0000:00:1c.2: found MSI capability
[ 4.906321] pcieport-driver 0000:00:1c.3: found MSI capability
[ 4.906580] pcieport-driver 0000:00:1c.4: found MSI capability
[ 5.655393] isapnp: No Plug & Play device found
[ 7.144185] hub 1-0:1.0: USB hub found
[ 7.160176] hub 2-0:1.0: USB hub found
[ 7.160771] hub 3-0:1.0: USB hub found
[ 7.161272] hub 4-0:1.0: USB hub found
[ 7.161787] hub 5-0:1.0: USB hub found
[ 7.162288] hub 6-0:1.0: USB hub found
[ 7.162790] hub 7-0:1.0: USB hub found
[ 7.163313] hub 8-0:1.0: USB hub found
[ 7.204612] device-mapper: multipath round-robin: version 1.0.0 loaded
[ 7.209361] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
[ 8.144540] hub 2-1:1.0: USB hub found
[ 14.208377] usb-storage: device found at 3
[ 14.208585] usb-storage: device found at 7
[ 14.358600] iTCO_wdt: Found a ICH9M TCO device (Version=2, TCOBASE=0x0460)
[ 14.457415] uvcvideo: Found UVC 1.00 device Acer Crystal Eye webcam (064e:a103)
[ 15.277968] lp: driver loaded but no devices found
[ 21.595181] vboxdrv: Found 2 processor cores.
[20249.126302] hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj.
ray@RayLaptop:~$ iwconfig
lo no wireless extensions.

eth0 no wireless extensions.

wmaster0 no wireless extensions.

wlan0 IEEE 802.11abgn ESSID:"ARDIANET"
          Mode:Managed Frequency:2.462 GHz Access Point: Not-Associated
          Tx-Power=15 dBm
          Retry min limit:7 RTS thr:off Fragment thr=2352 B
          Power Management:off
          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

pan0 no wireless extensions.

ray@RayLaptop:~$

What might be wrong please?
Ray