Setting duplex in the print dialog has no effect for some print drivers

I have found some problems in the cpdftocps filter. A fixed version is attached and this one does duplex on jobs where duplex is set via the GTK print dialog.

Uploaded a new CUPS package for Oneiric fixing this bug and bug 893676 to oneiric-proposed. As soon as this upload will get approved another comment with testing instructions will be posted here. Please test the fixed package then and tell here whether it solves your problem.

A debdiff of the changes is attached.

Updated the uploaded SRU to also fix the regressions on the IPP CUPS backend: bug 881843, bug 877958, bug 879625, and bug 883585

This bug was fixed in the package cups - 1.5.0-13

---------------
cups (1.5.0-13) unstable; urgency=low

  [ Till Kamppeter ]
  * debian/patches/ipp-patch-r8950+.patch: Revert the IPP backend to the state
    of CUPS 1.4.x, as the 1.5.x versiuon has major regressions (LP: #877958,
    LP: #879625, LP: #881843, LP: #883585, Closes: #638521, CUPS STR #3966,
    CUPS STR #3967). This patch will get removed as soon as upstream has fixed
    all these regressions. As upstream did not announce any new features for
    the IPP backend in the release notes for 1.5.x, we assume that with this
    step no features will get lost.
  * debian/patches/dont-send-malformed-dbus-messages.patch: Do not send D-Bus
    notifications with too few parameters when there are parameters which
    cannot be added to the D-Bus request, especially invalid UTF-8 strings.
    This made gnome-session-daemon crash (LP: #893676, CUPS STR #3984).
  * debian/local/filters/cpdftocps: The cpdftocps filter (used for PostScript
    printers and for drivers with PPDs which are not PDF-aware) did not
    recognize the duplex setting correctly, making duplex not working on
    many common printers (LP: #897723).
  * debian/local/filters/cpdftocps: Cleaned up the header comments.

  [ Martin-Éric Racine ]
  * [cups.postrm]: purge /etc/cups/ssl/server.[crt|key] and /etc/cups/ssl.

  [ Martin Pitt ]
  * debian/compat: Bump from 5 to 9, this apparently was forgotten in the
    Multi-Arch transition.
 -- Martin Pitt <email address hidden> Fri, 02 Dec 2011 11:05:51 +0100

Hello Lars, or anyone else affected,

Accepted cups into oneiric-proposed, the package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

Andreas, Peter, dejot, if the fix of bug 885118 did not already solve your duplex-printing problem, please test the proposed package to fix this bug as described in the previous comment and report here. Thanks.

Thanks a ton, Till and Martin. The newest build from "oneiric-proposed", cups (1.5.0-8ubuntu6), resolves the issue for me.

dejot, thank you very much for testing. Marking the bug as verified.

This bug was fixed in the package cups - 1.5.0-8ubuntu6

---------------
cups (1.5.0-8ubuntu6) oneiric-proposed; urgency=low

  * debian/patches/ipp-patch-r8950+.patch: Revert the IPP backend to the state
    of CUPS 1.4.x, as the 1.5.x versiuon has major regressions (LP: #877958,
    LP: #879625, LP: #881843, LP: #883585, Closes: #638521, CUPS STR #3966,
    CUPS STR #3967). This patch will get removed as soon as upstream has fixed
    all these regressions. As upstream did not announce any new features for
    the IPP backend in the release notes for 1.5.x, we assume that with this
    step no features will get lost.
  * debian/patches/dont-send-malformed-dbus-messages.patch: Do not send D-Bus
    notifications with too few parameters when there are parameters which
    cannot be added to the D-Bus request, especially invalid UTF-8 strings.
    This made gnome-session-daemon crash (LP: #893676, CUPS STR #3984).
  * debian/local/filters/cpdftocps: The cpdftocps filter (used for PostScript
    printers and for drivers with PPDs which are not PDF-aware) did not
    recognize the duplex setting correctly, making duplex not working on
    many common printers (LP: #897723).
  * debian/local/filters/cpdftocps: Cleaned up the header comments.
 -- Till Kamppeter <email address hidden> Tue, 29 Nov 2011 21:49:41 +0100

This is still a problem for me and has been around since 11.04 (unsure of CUPS version at the time). What do I need to do to help?

Ubuntu 11.10 (up to date)
CUPS 1.5.0-8ubuntu6
Canon MX870

Ashley, please follow the instructions of the sections "CUPS error_log" and "Capturing print job data" on https://wiki.ubuntu.com/DebuggingPrintingProblems. Thanks.