hwd是小写。而且你的源要正确配置(用默认的配置文件也可)
[root@myhost win32]# pacman -Ss hwd
current/lshwd 1.1.3-4
lists hardware and approp modules
extra/ddcxinfo-arch 0.8-1
utility to probe non/ddc monitors - used by hwd
extra/hwd 4.8.2-1
Hardware detect for Arch Linux (devfs and udev).