First of, go into your BIOS/UEFI and disable it there, if possible.
If you are on one of the rare devices, where this isnt possible or if you cant access your BIOS/UEFI for any reason, here is an alternative solution:
Check how your chipdriver is named with inxi:
Example:
[asta@asta-pc ~]$ inxi -N
Network: Card-1: Realtek RTL8723BE PCIe Wireless Network Adapter driver: rtl8723be
Card-2: Realtek RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller driver: r8169
[asta@asta-pc ~]$
inxi -F shows you a general overview, -N your Network stuff in specific, -G your GPU chip(s) and so on.
I like to disable the first one, because this WiFi chip still refuse to work correctly on linux and i replace it with an external chip.
The benefits are, that an disabled chip use no battery power and the network manager looks clean.
So, the driver is rtl8723be in this case.
Graphical way, recommended:
kdesu kate /etc/modprobe.d/blacklist.conf
Command line, if the graphical way is impossible:
sudo micro /etc/modprobe.d/blacklist.conf
type:
blacklist driver (example: blacklist rtl8723be)
Save the file and the chip is disabled
Issue reports here into the comments, thanks a lot in advanced