Hi, comparing the file OK400PCL.ppd with other ppd's, I noticed an odd extra parameter for Duplex. Applying the following patch:
<snip> --- /usr/share/ppd/okidata/OK400PCL.ppd.orig 2019-09-01 13:28:57.087482158 +0200 +++ /usr/share/ppd/okidata/OK400PCL.ppd 2019-09-01 13:29:42.562208160 +0200 @@ -238,17 +238,17 @@ *DefaultDuplex: None *Duplex None/None: " << - /Duplex false /Tumble false /Policies << /Duplex 2 >> + /Duplex false /Tumble false >> setpagedevice" *End *Duplex DuplexNoTumble/Long-Edge Binding: " << - /Duplex true /Tumble false /Policies << /Duplex 2 >> + /Duplex true /Tumble false >> setpagedevice" *End *Duplex DuplexTumble/Short-Edge Binding: " << - /Duplex true /Tumble true /Policies << /Duplex 2 >> + /Duplex true /Tumble true >> setpagedevice" *End *CloseUI: *Duplex </snip> seems to be /half/ of the solution: After re-installing the printer, duplex printing works, but /only/ with long-edge binding. Selecting short-edge binding also prints duplex, but again with long-edge binding, i.e. the “/Tumble true” setting seems to be ignored. I rarely use that option, but it should work, too… Thanks, Albrecht.
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