[HPLIP-Devel] PC-controlled duplex copying on HP LaserJet 3390 AIO does not work

[Till K. <til...@gm...>]

When I start the hp-toolbox and click on the "Make Copies" button, I get 
a GUI to control the copying functions of my printer. Problem is that 
there is no button to choose whether the documents in the ADF are 
double-sided or whether the copy should be printed double-sided. On the 
front panel I can choose "1 -> 1", "1 -> 2", and "2 -> 2". Is it 
possible that the capabilities of my device are not correctly registered 
in HPLIP?

    Till