Duplex problem

[stelmo at savba.sk]

Helge Blischke wrote:
> stelmo at savba.sk wrote:
> >
> > Anonymous wrote:
> > > Helge Blischke wrote:
> > > > stelmo at savba.sk wrote:
> > > > >
> > > > > This is a summary of what I have found out so far
> > > > >
> > > > > 1) The duplex is ok for text and other format files
> > > > > so it seems that the problem is with the ps files only
> > > > >
> > > > > 2) with a file produced with dvips (from a dvi file) I get no duplex
> > > > > with the same file after I had run ps2ps I get one blank page
> > > > >
> > > > > 3) if I replace pstops filter of cups 1.1.20 with the filter from
> > > > > the 1.1.14 release I get duplex right.
> > > > >
> > > > > I run debian sarge, cups version 1.1.20, printer is xerox phaser 6250dp and I use win's ppd.
> > > >
> > > >
> > > > Post (an URL to) a sample file. Whithout knowing the details, it is
> > > > virtually impossible to give any advice.
> >
> > the test files can be found at
> >
> > www.quniverse.sk/stelmo/cups
> >
> > this first file was generated usig latex and then dvips while the second
> > ps file was dowloaded from the internet.
> >
> > Peter
>
> Well, both files print duplex if requested from the command line (-o
> sides=two-sided-long-edge)
> at least with my installateion (CUPS 1.1.19 and the alternate pstops
> filter). But it may be
> that the 1.1.20 pstops filter is more regirous with respect to DSC
> comnpliance.
> Both files lack the "%%BeginProlog" comment line which may screw up
> things belonging into the
> prolog or setup section, respectively.
>
> Perhaps you could contact the radical eyes people to make dvips really
> DSC compliant (it should
> be not too difficult, believe me).
>
> Helge
>
> --
> H.Blischke at srz-berlin.de
> H.Blischke at srz-berlin.com
> H.Blischke at acm.org

In addition I have tried the following:
I downloaded fresh cupsys-1.1.20 source package from debian mirror and I have replaced the source file pstops.c with an older pstops.c
from the 1.1.14 version of cupsys and compile the whole thing (cupsys).
In this case (the binary files pstops differ, cupsys 1.1.20 vs. 1.1.14 but the same source file pstops.c)  I get duplex right.
So it seems to me that the problem lies in the filter pstops indeed (I just wanted to be sure and see clearly what you see right away)

Peter