Simple and fast method to disable an integrated WiFi card, just in case you adapter works very bad.
My Intel Broadband card sucks, so I bought an external usb adapter and I use it.
First, detect the kernel driver used by integrated card:
lspci -nnk | grep -iA2 net
Last line, you can read something like:
Kernel driver in use: IntegratedCardName
At this point, open /etc/blacklist.conf and append:
blacklist IntegratedCardName
Reboot and go! No more integrated Wifi card!
WARNING: DO NOT PULL OUT USB ADAPTER WHILE WIFI IS ON!
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