I have the newest ghostscript packages (where bug #112659 is fixed)
installed on nelson.suse.de (i386) and caps.suse.de (x86_64).

I tested all ghostscript devices (except bbox, cups, ijs, nullpage,
omni, stp) with the following command which uses the same
fd-redirection as the print filter foomatic-rip does:
--------------------------------------------------------------------
for d in $( gs -h \
            | grep '^   [a-t]' \
            | tr -d '\n' \
            | tr -s ' ' '\n' \
            | egrep -v 'bbox|cups|ijs|nullpage|omni|stp' )
do echo -e "\n$d"
   cat /usr/share/doc/packages/ghostscript/examples/colorcir.ps \
   | gs -dBATCH -dSAFER -dQUIET -dNOPAUSE -sDEVICE=$d \
        -sOutputFile='| cat >&3' /dev/fd/0 3>&1 1>&2 \
   | cat - >/tmp/$d.prn
   ls -l /tmp/$d.prn
done &>/tmp/log
--------------------------------------------------------------------

The following Ghostscript devices produce no output:
bmpa* (see bug #114056),
cgm24, cgm8, cgmmono,
cljet5,
devicen,
inferno,
oprp, opvp,
pcx2up,
pnga

The only Ghostscript device which is used in our PPDs is cljet5 in:
/usr/share/cups/model/Generic/PCL_5c_Printer-cljet5.ppd.gz
/usr/share/cups/model/HP/Color_LaserJet_5-cljet5.ppd.gz
/usr/share/cups/model/HP/Color_LaserJet_5000-cljet5.ppd.gz
/usr/share/cups/model/HP/Color_LaserJet_5M-cljet5.ppd.gz
/usr/share/cups/model/Kyocera/FS-5800C-cljet5.ppd.gz
/usr/share/cups/model/Kyocera/FS-5900C-cljet5.ppd.gz
/usr/share/cups/model/Kyocera/FS-8000C-cljet5.ppd.gz
/usr/share/cups/model/Xerox/DocuPrint_C20-cljet5.ppd.gz

But by default cljet5c (which does work) is used in this PPDs
because in those PPDs there is "*DefaultColorMode: Contone"
which uses cljet5c.

All other of the above Ghostscript devices are not used
in any of our PPDs.

Therefore we may ignore the non-working devices for 10.0