Lenovo ThinkPad T450
This article covers details pertaining to installing and configuring your Arch on Lenovo Thinkpad T450 laptop.
Installation
Supports both UEFI and MBR style bios. There are no issues with installing Arch Linux with the latest that is known Archiso. The installation process is the same Installation guide except, the sound.
Check out the T450s wiki, as pretty much everything from there works on the T450: Lenovo ThinkPad T450s
Sound
Make sure to install alsa-utils/ or that it is installed.
See ALSA#Set the default sound card to set the default sound card to Intel PCH (speakers and headphones).
/etc/modprobe.d/thinkpad-t450s.conf
options snd_hda_intel index=1,0
make sure to reboot after these changes.
Rebinding Forward and Back Keys
See T420