I am a big Arch Linux fan. I would not use it for production IT, but for personal use. I have Arch Linux in a VirtualBox VM on my Windows 10 Desktop. ArchLinux will not start in X after you upgrade from Kernal 4.4 to 4.5. Arch Linux just hangs.
Until it is fixed, this is a good workaround provided by lyndon  :
Edit /etc/default/grub and append
to the GRUB_CMDLINE_LINUX_DEFAULT variable so mine now looks like this:
Then I ran:
This definitely works