Duplex printing gives punched holes in wrong place

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http://askubuntu.com – When I print single sided, the punched holes (on A4) show up on the correct side of the documents. When I print duplex, the punched holes end up on the wrong side. (They should be on the left side if looking at the first page.) I understand there should be some kind of CUPS setting to make duplex printing use the correct orientation, but I can't find where it is. (This problem is to many/most duplex capable printers and not Linux specific btw, but I can't find in Ubuntu the setting.) The option to actually go to the printer and turn the pages physically is not acceptable, since I share of (HowTos)