Lenovo ThinkPad T450
This article covers details pertaining to installing and configuring your Arch on Lenovo Thinkpad T450 laptop.
Check out the T450s wiki, almost everything from there works on the T450: Lenovo ThinkPad T450s
See ALSA#Set the default sound card to set the default sound card to Intel PCH (speakers and headphones).
options snd_hda_intel index=1,0
Restart to set changes.
Rebinding Forward and Back Keys