> These two statements seem to be contradictory. If driverless printing is more reliable, that would seem to imply that files sent directly to the printer print more reliably than files sent through the CUPS filters, which would seem to imply that it is the filters, not the printer, that have bugs.
Driverless printing does not mean sending PostScript files directly to the printer, it means that the client discovers the printer via DNS-SD, queries the printer for its capabilities via IPP, and then prints in one of the formats PDF, Apple Raster, PWG Raster, or PCLm to the printer, dpending what it supports. CUPS does this automatically if no "conventional" print queue exists (remove any queue for your printer). Or you can create a print queue with the lpadmin command and the "-m everywhere" model specification. Does this perhaps work for you? ** Changed in: cups (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to cups in Ubuntu. https://bugs.launchpad.net/bugs/1968722 Title: File fails to print when rendered with CUPS, prints fine when fed directly to printer Status in cups package in Ubuntu: Incomplete Bug description: I have a printer named "duplex" configured to print through CUPS PostScript rendering ("MakeModel HP LaserJet 500 color M551 Postscript (recommended)", "DeviceURI socket://m551dn.kamens.brookline.ma.us:9100" in printers.conf) and the same physical printer configured driverless in CUPS with a different name ("MakeModel HP LaserJet 500 color M551, driverless, cups-filters 1.28.15", "DeviceURI implicitclass://HP_LaserJet_500_color_M551_1637DA/", "Option cups- browsed-dest-printer "1625 ipps://HP%20LaserJet%20500%20color%20M551%20%5B1637DA%5D._ipps._tcp.local/ pdf 600dpi"") in printers.conf. The attached file prints just fine when sent to the latter printer, i.e., prints fine with driverless printing, but fails to print when sent through the CUPS Postscript renderer, i.e., the former printer. In particular, the file stops printing after four pages and then the printer spits out this error page: ERROR: typecheck OFFENDING-COMMAND: known ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: cups 2.4.1op1-1ubuntu4 ProcVersionSignature: Ubuntu 5.15.0-25.25-generic 5.15.30 Uname: Linux 5.15.0-25-generic x86_64 ApportVersion: 2.20.11-0ubuntu80 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Tue Apr 12 08:21:44 2022 InstallationDate: Installed on 2019-01-02 (1195 days ago) InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3) Lpstat: device for duplex: socket://m551dn.kamens.brookline.ma.us:9100 device for HP_LaserJet_500_color_M551_1637DA: implicitclass://HP_LaserJet_500_color_M551_1637DA/ device for simplex: socket://m551dn.kamens.brookline.ma.us:9100 MachineType: Acer Predator G6-710 Papersize: letter PpdFiles: Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/simplex.ppd', '/etc/cups/ppd/duplex.ppd', '/etc/cups/ppd/HP_LaserJet_500_color_M551_1637DA.ppd'] failed with exit code 2: grep: /etc/cups/ppd/simplex.ppd: Permission denied grep: /etc/cups/ppd/duplex.ppd: Permission denied grep: /etc/cups/ppd/HP_LaserJet_500_color_M551_1637DA.ppd: Permission denied ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-25-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 SourcePackage: cups UpgradeStatus: Upgraded to jammy on 2022-02-20 (50 days ago) dmi.bios.date: 05/18/2016 dmi.bios.release: 5.11 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: R01-A4 dmi.board.name: Predator G6-710 dmi.board.vendor: Acer dmi.chassis.type: 3 dmi.chassis.vendor: Acer dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrR01-A4:bd05/18/2016:br5.11:svnAcer:pnPredatorG6-710:pvr:rvnAcer:rnPredatorG6-710:rvr:cvnAcer:ct3:cvr:sku: dmi.product.family: Acer Desktop dmi.product.name: Predator G6-710 dmi.sys.vendor: Acer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1968722/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp