Bug#781253: cups: no duplex printing (two-sided) with lp or lpr

[Brian Potkin <claremont102@gmail.com>]

reassign 781253 ghostscript
thanks



On Thu 30 Apr 2015 at 16:15:45 +0100, Brian Potkin wrote:

> On Thu 30 Apr 2015 at 12:54:09 +0200, Vincent Lefevre wrote:
> 
> > On 2015-04-30 10:32:33 +0100, Brian Potkin wrote:
> > > Having to switch renderer to get a satisfactory printout is usually an
> > > indication of a problem with the printer not dealing with valid
> > > PostScript rather than the filtering system.
> > 
> > Or could this be a bug with the default renderer (Ghostscript?)?
> > 
> > Or some incompatibility like the following one?
> > 
> >   http://comments.gmane.org/gmane.comp.printing.cups.bugs/9407
> 
> That link leads to
> 
>   http://bugs.ghostscript.com/show_bug.cgi?id=693652 ,
> 
> which is a pretty comprehensive discussion of the issues with buggy
> interpreters. So indeed, this does seem like the problem here. The
> contrast between gs and pdftops in Comment 26 is interesting.
> 
> Ultimately, I'd go with the simplest explanation; especially when the
> outcome is successful printing. Someone with more PostScript knowledge
> than I have might look deeper.

They have already looked, I think.

Today, while examining the way Ghostscript and pdftops operate I came
(completely unexpectedly) across this:

  http://bugs.ghostscript.com/show_bug.cgi?id=694852

Your problem appears to be exactly described in the bug title.

My previous efforts were focussed on exploring the reported behaviour in
your environment. Printing babel-bib.pdf to a queue on a Jessie machine
gives a duplexed output on my printer, which didn't happen before when
the renderer was also gs. This outcome inclines me to suggest a closing
of this report.

Your way of testing could involve cupsfilter (the Debian wiki has a page
on this) and sending a file with -oraw.

Regards,

Brian.