The piece of code to load the kernel modules is:
if [ "$LOAD_LP_MODULE" = "yes" -a -f /usr/lib/cups/backend/parallel \
-a -f /proc/devices -a -f /proc/modules -a -x /sbin/modprobe \
-a -z "$(grep -e ' lp$' /proc/devices 2>/dev/null)" ]; then
modprobe -q lp || true
modprobe -q ppdev || true
fi
It should be
if [ "$LOAD_LP_MODULE" = "yes" -a -f /usr/lib/cups/backend/parallel \
-a -f /proc/devices -a -f /proc/modules -a -x /sbin/modprobe]; then
modprobe -q lp || true
modprobe -q ppdev || true
fi
so that the parallel port kernel modules are simply always loaded if
$LOAD_LP_MODULE is set to "yes", /usr/lib/cups/backend/parallel is
present, and kernel modules are supported.
--
cupsys does not automatically detect parallel printer
https://bugs.launchpad.net/bugs/29050
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