Printing via foomatic/ghostscript to ljet4 with /UseWTS true lets Ghostscript error out

[hede]

Binary package hint: ghostscript

Printing to some HP LaserJet 4 printer with "Well-Tempered Screening" Halftoning Algorithm does not work.

Reporting this via Ubuntu 10.04, but it also happens with 10.10 the same way.
Both are using ghostscript version 8.71

BUT: Debian 5.0 and older Ubuntu 9.04 are fine! (Ghostscript 8.61/8.64)

Seems to be some bug in newer laserjet code in ghostscript or foomatic or... don't know.

(/tmp/foomatic-eMDeqa is some pdf which prints fine in Debian and Ubuntu 9.04 or in Ubuntu 10.XX with WTS disabled)
####
gs -dFirstPage=1 -q -dBATCH -dPARANOIDSAFER -dNOPAUSE -sDEVICE=ljet4 -dMediaPosition=0 -dDEVICEWIDTHPOINTS=595 -dDEVICEHEIGHTPOINTS=842 -r600x600 -sOutputFile=/tmp/foomatic-eMDeqa.testout -c '/Default << /SpotFunction { 180 mul cos exch 180 mul cos add 2 div } bind /HalftoneType 1 /AccurateScreens true /Frequency 137 /Angle 37 /HalftoneName (Round Dot Screen) >> /Halftone defineresource sethalftone << /HalftoneMode 1 /UseWTS true /AccurateScreens true >> setuserparams' -f /tmp/foomatic-eMDeqa
Error: /unknownerror in --.postinstall--
Operand stack:
   --dict:7/16(L)-- --dict:6/6(L)-- --nostringval-- --dict:48/48(ro)(L)-- --dict:6/6(L)-- --dict:1/10(L)-- --dict:49/61(ro)(L)-- false
Execution stack:
   %interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 1878 1 3 %oparray_pop 1877 1 3 %oparray_pop 1861 1 3 %oparray_pop --nostringval-- --nostringval-- 2 1 6 --nostringval-- %for_pos_int_continue --nostringval-- 1846 2 7 %oparray_pop 1848 7 7 %oparray_pop --nostringval--
Dictionary stack:
   --dict:1159/1684(ro)(G)-- --dict:1/20(G)-- --dict:75/200(L)-- --dict:75/200(L)-- --dict:108/127(ro)(G)-- --dict:288/300(ro)(G)-- --dict:21/25(L)--
Current allocation mode is local
GPL Ghostscript 8.71: Unrecoverable error, exit code 1
####

Simply editing "/UseWTS" from true to false completes without error.

I tried different -sDEVICE values. All non-Laserjet values (like Epson EPS output or PNG output) are fine. Most Laserjet values I tried are broken (laserjet, ljetplus, ljet2p, ljet4, lj3100sw). One is fine (lj4dithp).

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: ghostscript 8.71.dfsg.1-0ubuntu5.3
ProcVersionSignature: Ubuntu 2.6.32-25.44-generic 2.6.32.21+drm33.7
Uname: Linux 2.6.32-25-generic x86_64
Architecture: amd64
Date: Tue Oct 12 20:15:10 2010
Lpstat: device for HP_LaserJet_6L: hp:/par/HP_LaserJet_6L?device=/dev/parport0
MachineType: System manufacturer System Product Name
Papersize: a4
PpdFiles: HP_LaserJet_6L: HP LaserJet 6L Foomatic/ljet4 (recommended)
ProcCmdLine: root=/dev/md2 ro quiet splash acpi_enforce_resources=lax processor.max_cstate=1 crashkernel=384M-2G:64M,2G-:128M
ProcEnviron:
 LANGUAGE=de_DE:de:en_GB:en
 PATH=(custom, user)
 LANG=de_DE.utf8
 SHELL=/bin/bash
SourcePackage: ghostscript
dmi.bios.date: 06/19/2006
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080012
dmi.board.name: A8V-VM
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080012:bd06/19/2006:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnA8V-VM:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

[Till Kamppeter (till-kamppeter)]

WTS in Ghostscript is not supported any more according to the upstream developers. The db/source/opt/GS-HalftoningAlgorithm-Gray.xml file has to get removed from foomatic-db. I will fix it in one of the next foomatic-db uploads.

[Till Kamppeter (till-kamppeter)]

Removed the Halftoning Algorithm option in foomatic-db upstream as it does not work any more with recent Ghostscript versions.

[Launchpad Janitor (janitor)]

This bug was fixed in the package foomatic-db - 20110831-0ubuntu1

---------------
foomatic-db (20110831-0ubuntu1) oneiric; urgency=low

  * New upstream release
     - The Lexmark E120n does not work in PostScript mode when using
       generic PostScript PPD files. Updated comment and removed support
       by "Postscript" driver. Rated down to "Mostly" (LP: #802285).
     - Removed "Halftoning Algorithm" option, it does not work any more
       with current Ghostscript (LP: #659398).
     - Updated entry for the Lexmark E230: Added Device ID, support by
       PCL-5e drivers (LP: #821818).
     - Added the Brother HL-2070N (LP: #778620).
 -- Till Kamppeter <email address hidden> Wed, 31 Aug 2011 16:21:03 +0200