Lars, the problem is that if JCL options are member options of a
composite option (not forced, in our case "PrintoutMode"), they loose
their "*JCLOpenUI:"..."*JCLCloseUI:". This removes all evidence that
they are JCL options from them and so they are considered PostScript
options. This makes foomatic-rip converting the PDF job into PostScript
(using Ghostscript with "pswrite") and after that Ghostscript is called
again with the "pxlmono" driver, triggering Ghostscript upstream bug
#690025 (the bug causing the squares).

What has to be done is either

- Keep the "*JCLOpenUI:"..."*JCLCloseUI:" in the options even if they
are member options of a composite options, but check whether foomatic-
rip still works correctly with them, also whether cupstestppd does not
choke on the "FromPrintoutMode" choice whose code is not correct PJL,
and whether pstops or pdftopdf do not insert "%%
FoomaticRIPOptionSetting: fastr...@printoutmode" into the PJL header.

or

- If one of the problems mentioned above happens, return to the old
Foomatic-keyword-based scheme of JCL options for the case that a JCL
option is member option of a composite option.

This does not occur for forced composite options (in our case
"PrinterResolution"), as they are completely based on Foomatic keywords.

Here are the broken JCL options of the PPD file for the HP LaserJet 1200
with pxlmono (PPD from Fran Burstall or HP-LaserJet-1200-2.ppd from
Christoph):

*OpenUI *FastRes/Fast Res.: PickOne
*OrderDependency: 100 AnySetup *FastRes
*DefaultFastRes: FromPrintoutMode
*FastRes FromPrintoutMode/Controlled by 'Printout Mode': "%% 
FoomaticRIPOptionSetting: fastr...@printoutmode"
*FastRes Off/Off: "@PJL SET BITSPERPIXEL=1<0A>"
*FastRes On/On: "@PJL SET BITSPERPIXEL=2<0A>"
*CloseUI: *FastRes

*OpenUI *Economode/Toner Saving: PickOne
*OrderDependency: 100 AnySetup *Economode
*DefaultEconomode: FromPrintoutMode
*Economode FromPrintoutMode/Controlled by 'Printout Mode': "%% 
FoomaticRIPOptionSetting: economo...@printoutmode"
*Economode Off/Off: "@PJL SET ECONOMODE=OFF<0A>"
*Economode On/On: "@PJL SET ECONOMODE=ON<0A>"
*CloseUI: *Economode

-- 
black squares appearing instead of some letters when printing
https://bugs.launchpad.net/bugs/361772
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