Comment 19 for bug 1184665

The CUPS error_log attached to the Ubuntu bug report contains the following Ghostscript command lines (search for "renderer command"):

Job 111: gs -dFirstPage=1 -q -dBATCH -dPARANOIDSAFER -dQUIET -dNOPAUSE -dNOINTERPOLATE -sDEVICE=ljet4d -dDuplex -dMediaPosition=0 -dDEVICEWIDTHPOINTS=595 -dDEVICEHEIGHTPOINTS=842 -r600x600 -sOutputFile=- -f /var/spool/cups/tmp/foomatic-E6dq3t

Job 112: gs -dFirstPage=1 -q -dBATCH -dPARANOIDSAFER -dQUIET -dNOPAUSE -dNOINTERPOLATE -sDEVICE=ljet4d -dDuplex -dTumble -dMediaPosition=0 -dDEVICEWIDTHPOINTS=595 -dDEVICEHEIGHTPOINTS=842 -r600x600 -sOutputFile=- -f /var/spool/cups/tmp/foomatic-a4gEnk

Job 113: gs -dFirstPage=1 -q -dBATCH -dPARANOIDSAFER -dQUIET -dNOPAUSE -dNOINTERPOLATE -sDEVICE=ljet4d -dDuplex -dTumble -dMediaPosition=0 -dDEVICEWIDTHPOINTS=595 -dDEVICEHEIGHTPOINTS=842 -r600x600 -sOutputFile=- -f /var/spool/cups/tmp/foomatic-Eb3AuL

Job 114: gs -dFirstPage=1 -q -dBATCH -dPARANOIDSAFER -dQUIET -dNOPAUSE -dNOINTERPOLATE -sDEVICE=ljet4d -dDuplex -dTumble -dMediaPosition=0 -dDEVICEWIDTHPOINTS=595 -dDEVICEHEIGHTPOINTS=842 -r600x600 -sOutputFile=- -f /var/spool/cups/tmp/foomatic-KFdOXu

Job 115: gs -dFirstPage=1 -q -dBATCH -dPARANOIDSAFER -dNOPAUSE -dNOINTERPOLATE -sDEVICE=ljet4 -dMediaPosition=0 -dDEVICEWIDTHPOINTS=595 -dDEVICEHEIGHTPOINTS=842 -r600x600 -sOutputFile=- -f /var/spool/cups/tmp/foomatic-r2we33

Job 116: gs -dFirstPage=1 -q -dBATCH -dPARANOIDSAFER -dQUIET -dNOPAUSE -dNOINTERPOLATE -sDEVICE=ljet4d -dDuplex -dMediaPosition=0 -dDEVICEWIDTHPOINTS=595 -dDEVICEHEIGHTPOINTS=842 -r600x600 -sOutputFile=- -f /var/spool/cups/tmp/foomatic-n45KYl

Job 111: ljet4d Duplex
Job 112: ljet4d Duplex Tumble
Job 113: ljet4d Duplex Tumble
Job 114: ljet4d Duplex Tumble
Job 115: ljet4
Job 116: ljet4d Duplex

The user tells that all ljet4d jobs come out duplex long-edge, all ljet4 jobs one-sided.

The command line shows that the -dTumble option gets actually supplied.