NetworkManager (in Mint 17.2 mate) recognizes wifi, but does not connect. The solution is to disable ipw2100 driver and install a windows-driver using ndisgtk
Network: Card-1: Realtek RTL-8100/8101L/8139 PCI Fast Ethernet Adapter driver: 8139too
Card-2: Intel PRO/Wireless LAN 2100 3B Mini PCI Adapter driver: ipw2100
sudo modprobe -r ipw2100
With windows driver wifi connects (slowly, about in a minute).
There is two drivers who both are working
Driver 1 -> Intel(R)PROWireless21_125836.zip
Driver 2 -> W20mPCI.zip