12.04 - Wireless isn't working on Lenovo T400

This problem started after upgrading to 12.04, an my system is 'up2date'

Have tried most of the solution-proposals found on the net.

lspci -nnk | grep -iA2 net

00:19.0 Ethernet controller [0200]: Intel Corporation 82567LF Gigabit Network Connection [8086:10bf] (rev 03)
        Subsystem: Lenovo Device [17aa:20ee]
        Kernel driver in use: e1000e
--
03:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 5100 AGN [Shiloh] Network Connection [8086:4237]
        Subsystem: Intel Corporation WiFi Link 5100 AGN [8086:1211]
        Kernel driver in use: iwlagn

iwconfig

>lo        no wireless extensions.

>eth0      no wireless extensions.

>wlan0     IEEE 802.11abgn  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=15 dBm   

          Retry  long limit:7   RTS thr:off   Fragment thr:off

Encryption key:off

Power Management:off

sudo lshw -C network

*-network

description: Ethernet interface

product: 82567LF Gigabit Network Connection

vendor: Intel Corporation

physical id: 19

bus info: pci@0000:00:19.0

logical name: eth0

version: 03

serial: 00:22:68:1a:c4:75

size: 100Mbit/s

capacity: 1Gbit/s


width: 32 bits

clock: 33MHz

capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=1.0.2-k2 duplex=full firmware=1.8-3 ip=192.168.2.154 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
resources: irq:29 memory:fc000000-fc01ffff memory:fc024000-fc024fff ioport:1820(size=32)

*-network DISABLED
description: Wireless interface
product: PRO/Wireless 5100 AGN [Shiloh] Network Connection
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlan0
version: 00
serial: 00:26:c6:6c:2d:24
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlagn latency=0 multicast=yes wireless=IEEE 802.11abgn
resources: irq:30 memory:f4300000-f4301fff

Please help