After an update sometime ago, cups started to fail when trying to print to printers that were automatically detected. The printers address would show up as
dnssd://Brother%20DCP-L2540DW%20series._ipp._tcp.local/?uuid=e3248000-80ce-11db-xxxx-xxxxxxxxx
When trying to print to such a printer, cups would give the following error:
Unable to locate printer 'BRWXXXXXX.local'
If you have avahi running, then you can run
lpinfo -v
to list all the network printers. This would show, for example
network ipp
network ipps
network socket
file cups-pdf:/
direct hp
network lpd
network http
network https
network smb
direct hpfax
network dnssd://Brother%20DCP-L2540DW%20series._ipp._tcp.local/?uuid=e3248000-80ce-11db-xxxx-xxxxxxxxx
network lpd://BRW1008B19C71E2/BINARY_P1
The problem is that the correct libraries were not installed; see this askubuntu page. It tells you that you need to install the nss-mnds library. This is some sort of dns service that is necessary for cups to function. Once you install it using
pacman -S nss-mdns
Edit the file
/etc/nsswitch.conf
so that the hosts line contains.
hosts: files mdns_minimal dns mdns
