This isn't an issue with the driver, but I've just it wanted to test monitor mode/injection. So I installed aircrack and ran airmon-ng start wlan0, which complained about needing iw installed. Yet 'apt-get install iw' removes aircrack and vice versa, wtf?
ifconfig wlan0 down iwconfig wlan0 mode Monitor ifconfig wlan0 up
ifconfig wlan0 down iwconfig wlan0 mode Managed ifconfig wlan0 up