If your laptop has either Atheros AR9285 or Ralink RT3090 wireless adapter, then Ubuntu 11.10 shows that driver is properly loaded, wlan0 interface is up, however you can not enable wireless in NetworkManager. Wireless is turned off instantly after you click on “Enable Wireless” or after manually bringing the interface up.
The solution is to blacklist the
acer-wmi module: open the file
/etc/modprobe.d/blacklist.conf and add this line:
Note: in Archlinux the module is named