This you can only fix if you can find this Ghostscript call in a script file provided by Samsung (open the executables of the Samsung driver with an editor, some are probably scripts. Searching for "ExecProgramV" could help here). Edit the script to use -_ instead of - at the end of the command line. Tell here what you have edited. Unfortunately, I cannot help if the Ghostscript command line is generated by a closed-source parts of the Samsung driver. In this case we need really a fix of the upstream bug in Ghostscript.
I have discovered two problems in your error_log:
1. Possible AppArmor problem, Samsung driver cannot write log file:
D [08/Dec/ 2007:02: 06:10 +0000] [Job 207] /var/tmp/ rastertosamsung spl.log file open error
Do
sudo aa-complain cupsys
to work around this.
2. This is probably the real problem. The Samsung driver is callin Ghostscript on its own:
D [08/Dec/ 2007:02: 06:10 +0000] [Job 207] ExecProgramV: 'gs' '-dNOPAUSE' '-dBATCH' '-dSAFER' '-q' '-sOutputFile=-' '-sDEVICE=pbmraw' '-r600x600' '-dDEVICEWIDTHP OINTS=612' '-dDEVICEHEIGHT POINTS= 792' '-dFIXEDMEDIA' '-'
This you can only fix if you can find this Ghostscript call in a script file provided by Samsung (open the executables of the Samsung driver with an editor, some are probably scripts. Searching for "ExecProgramV" could help here). Edit the script to use -_ instead of - at the end of the command line. Tell here what you have edited. Unfortunately, I cannot help if the Ghostscript command line is generated by a closed-source parts of the Samsung driver. In this case we need really a fix of the upstream bug in Ghostscript.