Terry : Hold packages

To prevent packages from updating

# Pacman won't upgrade packages listed in IgnorePkg and members of IgnoreGroup
#IgnorePkg =
#IgnoreGroup =

#NoUpgrade =
#NoExtract =

For example, stop updating xorg-server

Edit:

/etc/pacman.conf

add

IgnorePkg = xorg-server

Sync with repository

pacman -Syu