[libreoffice-users] duplex printing - two printers - only one will duplex

I am wondering about the Duplexing issues with LO.

I still am running 3.4.5 64-bit DEBs install on Ubuntu. [plus a Vista 
laptop].

I have two printers that have a duplexer as part of the printer.

Epson Artisan 810 inkjet.
HP Laserjet 2300dn.

I have had the Epson since 3.3.2 or 3.3.3 came out.  I never could get 
it to print out a duplex document [i.e. print on both sides of the 
sheet].  I always has to print/export to a PDF file and use the PDF 
viewer to print the document with the duplex option.

Today, I just setup a HP Laserjet 2300dn, and I just printed a document 
using its duplex option.  It worked.

So here is my question:
Does anyone know why LO will not print out a two sided document using 
the Epson Artisan 810 inkjet printer, but it will print the same 
document out duplexed [double sided] with the HP Laserjet 2300dn?

It seems weird that duplexing will not work for one printer but it will 
for the other.

If I want to print out a color document, two-sided, I have to 
print/export it to a PDF file and then print out the PDF file using the 
duplex option for the Epson printer.  LO's print manager [?] will not 
print the document 2-sided to the Epson printer, even though it shows up 
as one of the print options.  But when printing to the "new" HP Laserjet 
2300dn printer, I click on the duplex option and it works fine.

So any clues what is needed to get the Epson inkjet printer to print out 
a duplex sheet [a tri-fold brochure] when I go through the printer menu 
system and select the duplex option over the default one-sided printing?



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