I have printer brand Canon model BJC-3000 in my slackware with upgraded kernel 2.6.8.1. I go to localhost:631 add my printer and successfully added. But when i type "echo hellp > /dev/lp0" it is no output. then i try to click the print test page. It show the job was complete but there is no paper or test page is printed out. And i try to print the document in Open Office, It is the same thing, there is no document is printed out. help~~~~

I believe that you don't have the parallel port support and/or the parallel printer support enabled. You have to edit your /etc/rc.d/rc.modules to enable these on boot by uncommenting and/or .
After that reinstall your driver and reboot.

#### PC parallel port support ###
#if cat /proc/ksyms | grep "\[parport_pc\]" 1> /dev/null 2> /dev/null ; then
# echo "parport0 is built-in, not loading module" > /dev/null
#else
# if [ -r /lib/modules/$RELEASE/kernel/drivers/parport/parport_pc.o \
# -o -r /lib/modules/$RELEASE/kernel/drivers/parport/parport_pc.o.gz \
# -o -r /lib/modules/$RELEASE/kernel/drivers/parport/parport_pc.ko ]; then
# # Generic setup example:
# /sbin/modprobe parport_pc
# # Hardware specific setup example (required for PLIP and better
# # performance in general):
# #/sbin/modprobe parport_pc io=0x378 irq=7
# fi
#fi
#### Parallel printer support ###
#if cat /proc/ksyms | grep "\[lp\]" 1> /dev/null 2> /dev/null ; then
# echo "lp support built-in, not loading module" > /dev/null
#else
# if [ -r /lib/modules/$RELEASE/kernel/drivers/char/lp.o \
# -o -r /lib/modules/$RELEASE/kernel/drivers/char/lp.o.gz \
# -o -r /lib/modules/$RELEASE/kernel/drivers/char/lp.ko ]; then
# /sbin/modprobe lp
# fi
#fi


I edit the file and i found this. So, I just need to remove hash sign in each line to uncomment it?

Go to the /etc/cups/cupsd.conf and set
LogLevel debug

remove /var/log/cups/error_log

restart cups.

look into /var/log/cups/error_log

I had uncommenting it and it is work thanks guy