Is there a known problem with duplex printing to HP lasers in Oneiric?
Have installed an HP LJ2605dn, using the auto-detected "HP Color LaserJet 2605dn Foomatic/Postscript" driver.
In "Printing" settings, duplex is set to "Loong Edge (default)".
All attempts to print duplex, from Firefox, Opera, LibreOffice & a2ps fail: the printer reverses every sheet, but only prints on one side of each.
Same happens on two machines [Acer desktop + Eee netbook].
There was no problem under Natty, so I assume the problem is either in the latest driver or PPD file.