I have a PI3 and bought a HiFiBerry DAC+ Pro, then found that that card doesn't work with the onboard wifi on the Pi3. This is a known problem that the hifiberry folk haven't been able to fix yet.
So I now have a "Wipi" external USB adaptor but i need to be able to disable the internal wifi.
Come someone tell me how to disable WLAN0?
thanks!
In case it's useful, my debug info is:
http://pastebin.com/YLYLKXJN