according to the lastest news of archlinux :
https://www.archlinux.org/
those package need to be removed and installed from AUR if it's necessary :
xf86-input-joystick, xf86-input-acecad, xf86-video-apm, xf86-video-ark, xf86-video-chips, xf86-video-glint, xf86-video-i128, xf86-video-i740, xf86-video-mach64, xf86-video-neomagic, xf86-video-nv, xf86-video-r128, xf86-video-rendition, xf86-video-s3, xf86-video-s3virge, xf86-video-savage, xf86-video-siliconmotion, xf86-video-sis, xf86-video-tdfx, xf86-video-trident, xf86-video-tseng
so ask yes at pacman when it ask you to remove those packages and install them form AUR if you want to use it. keep in mind, may some package coming from AUR are out of date