The wifi card that was installed in my laptop was an Intel® Centrino® Advanced-N 6205
The N 6205 is a dual band card but unlike the AC 7620, It doesn't have an integrated bluetooth card, nor 802.11ac
I previously flashed the bios with 1vyrain see article, which wipes the whitelist that would otherwise prevent me from installing hardware not on the list. So I can now install the AC 7620.
The T430 doesn't activate this card unless the 51st pin is removed. I removed the pin with my Dremel (some use tape).
This pin is the last pin on the right when the card is face up. I put the laptop back together and checked.
The wifi came on automatically.
I then installed Bluez:
sudo pacman -S bluez sudo pacman -S bluez-utils sudo pacman -S blueman
sudo micro /etc/bluetooth/main.conf set AutoEnable=true
sudo systemctl enable bluetooth.service
sudo systemctl start bluetooth.service
I made sure pulseaudio was installed:
sudo pacman -S pulseaudio
sudo pacman -S pulseaudio-bluetooth
sudo pacman -S pavucontrol
sudo systemctl enable pulseaudio
sudo systemctl start pulseaudio
Then I connected my bluetooth headset and ... it just worked