I got the same problem om my Dell D520 with Intel Pro 3945. Without
warning my wireless connection drops.

dmesg | grep eth1
[17179618.060000] ADDRCONF(NETDEV_UP): eth1: link is not ready
[17179859.528000] ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[17179870.268000] eth1: no IPv6 routers present

While the connection is down I can do a "sudo iwlist eth1 scan", and get
the SSIDs. But I can't connect to ant of them. I've tried different
WLANs, with and without WEP.

-- 
[ Wifi card Intel Pro 3945 ] - My wifi connection "disappears" after a while...
https://launchpad.net/bugs/70719

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