pacman -S xf86-video-ati
resolving dependencies...
looking for conflicting packages...
:: xf86-video-ati and catalyst-server are in conflict (xorg-server). Remove catalyst-server? [y/N] Y
error: failed to prepare transaction (could not satisfy dependencies)
:: catalyst-utils: removing catalyst-server breaks dependency 'catalyst-server>=1.7.0'
:: catalyst-utils: removing catalyst-server breaks dependency 'catalyst-server<1.18.0'
:: catalyst-video: removing catalyst-server breaks dependency 'catalyst-server<1.18.0'
:: gdm: removing catalyst-server breaks dependency 'xorg-server'
:: gdm: removing catalyst-server breaks dependency 'xorg-server-xwayland'