ferro, that means that the PostScript which current Ghostscript and
current Poppler are producing from PDF input does not trigger paper tray
changes in your printer.

To investigate how PostScript has to look like so that tray changes will
happen (so that one can improve filters in the future) can you please
try the following:

Make some copies of the printout file which you have attached in the
last posting.

Have a look at all four page headers, beginning with "%%Page" and ending
with "%%EndPageSetup". Now we try two approaches to make the PostScript
file switching trays:

1st approach: Remove the very first "%%PageBoundingBox:" lines directly
after "%%Page". Do not remove the "%%PageBoundingBox:" lines after
"%%BeginPageSetup".

2nd approach: Somewhere between "%%BeginPageSetup" and "%%EndPageSetup"
setup add the line

<</PageSize [XXX YYY] /ImagingBBox null>> setpagedevice

replacing XXX and YYY by the two numbers in the beginning of the line
which ends with "setpagesize".

3rd approach: Do both the 1st and the 2nd approach.

Edit always all four page headers as described. Send all the three
approaches unfiltered (with the "nc ..." command line) to the printer.
Which of these approaches make the printer switching trays.

If you can get hold on a machine with an old CUPS 1.2.x environment
where the tray switching still worked, please make a copy of your print
queue which prints into a file there, too (see my previous postings,
"lpadmin -p test ....") and post the output PostScript file from there.

This is all to allow improvements of the filters in the future. For
Intrepid we will make an SRU to at least get back to Hardy's behavior of
scaling down the A3 pages to A4.

-- 
A3 pdf file is cropped and printed on A4 paper
https://bugs.launchpad.net/bugs/310575
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