Wifi no longer woking on Acer Travelmate TimelineX 8172T after natty upgrade

[Bapf]

Binary package hint: bcmwl-kernel-source

Since the update to Natty my Wifi (BCM43225) is no longer working which worked flawlessly up until now.
The Network Manager always says "device not ready" an if I try to turn it on with the kill-switch I get the following in /var/log/syslog:

Apr 30 12:29:36 kahlan NetworkManager[861]: <info> WiFi now enabled by radio killswitch
Apr 30 12:29:36 kahlan NetworkManager[861]: <info> (wlan0): bringing up device.
Apr 30 12:29:36 kahlan NetworkManager[861]: (nm-device-wifi.c:3785):real_set_enabled: runtime check failed: (priv->supplicant.iface == NULL)
Apr 30 12:29:36 kahlan kernel: [ 1568.221678] ADDRCONF(NETDEV_UP): wlan0: link is not ready
Apr 30 12:29:36 kahlan kernel: [ 1568.368464] ADDRCONF(NETDEV_UP): wlan0: link is not ready
Apr 30 12:29:36 kahlan NetworkManager[861]: <info> (wlan0): supplicant interface state: starting -> ready
Apr 30 12:29:36 kahlan NetworkManager[861]: <info> (wlan0): device state change: 2 -> 3 (reason 42)
Apr 30 12:29:36 kahlan wpa_supplicant[1027]: Failed to initiate AP scan.
Apr 30 12:29:36 kahlan NetworkManager[861]: <info> WiFi now disabled by radio killswitch
Apr 30 12:29:36 kahlan NetworkManager[861]: <info> (wlan0): device state change: 3 -> 2 (reason 0)
Apr 30 12:29:36 kahlan NetworkManager[861]: <info> (wlan0): deactivating device (reason: 0).
Apr 30 12:29:36 kahlan NetworkManager[861]: <info> (wlan0): taking down device.

(Note: This is just _one_ keypress.)

I already tried the older version of the driver (as mentioned in another) bug but the behavior didn't change.

[Brubel Sabs (brubelsabs)]

I am not really sure If this is a duplicate of #732677, since after plugging in a USB-WiFi adapter (RaLink) there was still no network, even though I enabled WiFi. The RaLink Wifi adapter works like a charm on ubuntu 10.10.