[okular] [Bug 373133] 16.12.0 Okular duplex printing on but no duplex printing done

[Michael Weghorn]

https://bugs.kde.org/show_bug.cgi?id=373133

--- Comment #24 from Michael Weghorn <m.weghorn at posteo.de> ---
(In reply to Gunter Ohrner from comment #23)
> It's also a Brother printer (DCP 7065DN) but actually seems to use the
> standard Duplex keyword.

The fact that it uses the "Duplex" option seems to explain why it works so well
in other applications.
I just set up a dummy printer with that PPD and checked what options are passed
to CUPS when printing from Konqueror and Okular.
In my case, both options "Duplex" and "sides" were passed as expected for both
Okular and Konqueror (using current KDE neon gitstable), so I wonder a bit why
the two applications behave differently when printing to a real printer.
Does a user-specific default value as described in comment 9 possibly play a
role? (I did not have such a file '~/.cups/lpoptions'.)

In addition, CUPS's 'error_log' file with Debug level enabled might help, as
described in comment 12, point 1).

[As far as I understand this issue right now, different aspects might come into
play when using either the standardized "Duplex" keyword or a vendor-specific
one, so I think it might possibly make sense to split this up into two separate
bug reports in case this assumption is confirmed by your reply to the above
answers (to make it possible to better focus on the single aspects).]

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