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81 lines
5.2 KiB
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81 lines
5.2 KiB
Text
= CUPS – Filing a Bug Report
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Brandon Nielsen; Zdenek Dohnal
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:revnumber: all
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:revdate: 2022-05-15
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:category: Printing
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:tags: How-to, Bug-Report, Cups
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// include::partial$attributes.adoc[]
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== Deciding which component
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Problems involving printing may relate to several components.
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The configuration GUI (See above) is either https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=control-center[GNOME 3 System Settings application] or https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=system-config-printer[system-config-printer]. These packages also provide the printer applet, handle automatic queue creation, and disable/enable queues when USB printers are disconnected and reconnected.
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Most GTK+ applications use the GTK+ print dialog. If the problem occurs when using GTK+ applications but not when printing from the command line or from another non-GTK+ application, the problem should probably be reported against the GTK+ version which the application uses. You can find out the version by the following query (*thunderbird* is used as an example of RPM package):
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----
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$ rpm -q thunderbird | grep gtk
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libgtk-3.so.0
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----
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From the output you can see *thunderbird* uses GTK+ version 3.
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If the problem occurs with only one GTK+ application, and other GTK+ applications print fine, the bug should be filed against that particular application.
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If the problem only happens with PDF files, the bug may well be in https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=poppler[poppler] (the CUPS *pdftops* filter is a wrapper around one of the poppler utility programs).
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Report bugs only seen using the *smb* backend against https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=samba[samba].
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For bugs only seen when using the *hp* backend, or the hpijs or hpcups drivers, select https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=hplip[hplip] for the component.
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For bugs for cups-browsed daemon and its printer discovery, please select https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=cups-filters[cups-filters]
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Other possibilities, depending on the problem, include:
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* https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=foomatic[foomatic] (the Foomatic CUPS filter and driver)
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* https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=foomatic-db[foomatic-db] (the actual printer database used by Foomatic)
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* https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=ghostscript[ghostscript] (which converts PostScript to other formats)
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* https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=gutenprint[gutenprint] (a driver that supports very many printers)
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For anything else, or if you are not sure, choose https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=cups[cups] or use your best guess.
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== Other information to include
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Be prepared to include some information about your system as well.
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=== Before gathering of information
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* Please change your OS locale to English.
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* Please attach gathered information as archive (example is xref:cups-useful-tricks.adoc#_how_to_compress_files[here], you may need root permissions) to the bugzilla issue.
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* Please do not forget to trigger your issue after debug enabling and restarting cups and before information gathering.
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=== Information to gather
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* the PPD file for the print queue (from the `/etc/cups/ppd` directory)
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* the document you are attempting to print -- if the document is large, please try to see if the problem also occurs with a smaller document
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* cupsd journal logs when debug level 2 is turned on. See the xref:how-to-debug-printing-problems.adoc#_enable_cups_debug_logging[how-to for turning debug2 on and for getting logs from systemd-journald].
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* if the issue is connected to a print job, attach journal logs for this specific job too. How-to get logs xref:how-to-debug-printing-problems.adoc#_get_a_job_log_for_a_specific_job_id[here], example with JID. You can find out JID value by command:
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----
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$ lpstat -W all
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----
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Find your job there and JID is a number after '-'.
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* If the issue is about f.e. 'printing from evince prints garbage, but printing from libreoffice works', then attach two separate files - first will contain logs when you print from evince, latter logs when you print from libreoffice.
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* [filename]`troubleshoot.txt` from system-config-printer (BEWARE: it doesn't contain journal logs - don't forget to attach them too).
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* xref:how-to-debug-printing-problems.adoc#_what_make_and_model_is_my_printer[make and model] of printer
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* config files - [filename]`/etc/cups/client.conf` (if it contains any changes from default), [filename]`/etc/cups/cupsd.conf`
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* if the issue is with cups-browsed and printer's discovery, attach [filename]`/etc/cups/cups-browsed.conf` and cups-browsed logs gained by xref:how-to-debug-printing-problems.adoc#_cups_browsed_logging[this how-to].
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Some example documents can be found in the https://fedoraproject.org/wiki/Category:Printing_Test_Cases[Printing Test Cases category].
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== Further reading
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The https://fedoraproject.org/wiki/Printing[main printing page] and the xref:cups-terminology.adoc#_printing[printing terminology page] have more information about how printing works in Fedora.
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