I have recently rebuilt Gonzo my Arch Thinkpad. Soon after I reinstalled Arch and updated my system I started to get a load of boot messages stating that certain /etc/*.conf files would need /etc/modprobe.d/ conf file and that the .pacsave file would need replacing.
I found that the following link stating that a newer version of module-init-tools moved the /etc/modprobe.conf file to /etc/modprobe.d/modprobe.conf. The update copies your /etc/modprobe.conf to /etc/modprobe.conf.pacsave and creates the /etc/modprobe.d/modprobe.conf. However, it does not copy over the contents of the old file to the new file. So to cure the issue just copy the contents of /etc/modprobe.conf.pacsave to the new /etc/modprobe.d/modprobe.conf and rename the old file (/etc/modprobe.conf.pacsave).
This cured half of my messages.
I found that I also had to the same for my /etc/frambuffer.conf (it had a /etc/framebuffer.conf.pacsave file created. I copied the contents to my new /etc/modprobe.d/framebuffer.conf and deleted the original).
This cured all of my boot messages.