Those are backends, filters, and other binaries that were once part of CUPS but have been dropped from the project. The Linux Foundation's OpenPrinting workgroup provides cups-filters. These should be discovered automatically. To test if they are working before creating a PKGBUILD, PPD files can be manually added to /usr/share/cups/ model, the driver should be available after the next restart of the cups service.ĬUPS includes support for AirPrint and IPP Everywhere printers. When a PPD file is provided to CUPS, the CUPS server will regenerate the PPD files and save them in /etc/cups/ppd/. It also supplies PPD files for each printer, but most are available through foomatic or the recommended driver package. The OpenPrinting Printer List provides driver recommendations for many printers. For details on how CUPS uses PPDs and filters, see. To drive a printer, CUPS needs a PPD file and, for most printers, some filters. See CUPS/Printer-specific problems for an incomplete list of drivers that others have managed to get working. The drivers for a printer may come from any of the sources shown below. Most recent printers (2010+) support driverless usage by implementing AirPrint and/or IPP_Everywhere (c.f. (Discuss in Talk:CUPS#CUPS printer drivers and backends are deprecated) Explain what is/will be handled by cups and what by cups-filters and/or other software. Reason: CUPS is planning to drop PPD and driver support ( CUPS issue 103), instead relying entirely on IPP Everywhere. local hostname resolution with Avahi and restart rvice. To discover, make use of discovered or share printers using DNS-SD/mDNS, setup. Documentation for adding the queue with lpadmin can be found in following sections and official documentation at Setting up printers. obtained via printers display or other network scanning approaches).Ī CUPS queue can be directly added to use the printer. It is not required to rely on dynamic printer discovery on the network (DNS-SD/mDNS) when the address of the printer is known (e.g. # dmesg | grep -i parport parport0: Printer, Hewlett-Packard HP LaserJet 2100 Series To use a parallel port printer, the lp, parport and parport_pc kernel modules are required. To see if your USB printer is detected, make sure you have the usbutils package installed, then:īus 001 Device 007: ID 03f0:1004 Hewlett-Packard DeskJet 970c/970cse For example, if the printer is connected to a USB port, it uses the USB back-end.Īdditional steps for printer detection are listed below for various connection interfaces. The filter converts the PDF file to a format understood by the printer.CUPS then looks at the printer's PPD file (printer description file) and figures out what filters it needs to use to convert the PDF file to a language that the printer understands (like PJL, PCL, bitmap or native PDF).An application sends a PDF file to CUPS when 'print' has been selected (in case the application sends another format, it is converted to PDF first).It is important to know how CUPS works if wanting to solve related issues: Then, whenever a program attempts to connect to one of these CUPS sockets, systemd will start rvice and transparently hand over control of these ports to the CUPS process. If cups.socket is enabled (and rvice is disabled), systemd will not start CUPS immediately it will just listen to the appropriate sockets. Then enable and start rvice or alternatively use socket activation to only start CUPS when a program wants to use the service.Ĭups provides a cups.socket unit. The location can be changed in /etc/cups/nf. By default, PDF files are stored in /var/spool/cups-pdf/ username/. Optionally, install the cups-pdf package if you intend to "print" into a PDF document. The package is needed because IPP Everywhere sends a PDF directly to the printer, therefore cups-pdf is needed to convert everything you want to print to a PDF first. Without this package you may see an error like: client-error-document-format-not-supported. Note: As drivers are deprecated in CUPS in favor of IPP Everywhere you may need to install cups-pdf to get printing to work.
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