I have Lenovo Z575 and problems with Wifi connection. After a short battle with drivers, and eventually installing ndiswrapper and windows drivers, wifi0 interface does not show up in the ifconfig...
ifconfig -a gives only
Although, wireless hardware is presend;
02:00.0 Network controller: Ralink corp. RT3090 Wireless 802.11n 1T/1R PCIe
Ignoring unknown interface wifi0=wifi0.
Any idea how to fix wifi?
rfkill unblock all does not help