What the topic says, basicly :/
In KDE Printing Manager, I select Local Printer in the box, and it has about 30 serial ports, 30 usb ports, and one parallel which doesn't put in a URI (parallel:/dev/lp0). When I put in my own uri, it says "The local uri doesn't correspond to a detected port. continue?"

I click yes...
Then I get this error...
Unable to change printer properties. Error received from manager:
The requested operation cannot be completed.

I have an Epson Stylus Color 660, and am using Gimp-Print drivers.

If your printer is connected to your computer by a normal parallel-port printer cable, I think you should select the normal, plain vanilia, " parallel:/dev/lp0 "

( But what do I know? I've spent this whole weekend trying to get my printer set up, and it's not working yet. But it's getting close. ) Hang in there!

I am having the same problem. Moreover, I tried parallel:/dev/lp0 (/dev/lp0 exists) but it did not help. I also tried preloading lp.o and parport.o, to no avail

Hey man, have you figured an answer to this? I have the exact same issue.

There has to be some good reason why lp0 is not listed, and that any manual override
doesn't work. In addition, I have tried the command:

cat filename > /dev/lp0

and I get ascii out my printer. So, it isn't like lp0 is dead or something.

I fixed this a bit ago by upgrading my kernel. For some reason it wasn't compiled into the kernel, and I couldn't find a module for it. Just make sure if you do upgrade your kernel, you select the Parellel port support

I fixed it in a similar way. In make menuconfig I set the following entries from <M> to <*>:
Character devices -> parallel printer support
Parallel port support and PC-style hardware.
I have not tried to figure out which one is really necessary, but with this mod, it works.

Another possibility for some of these problems is to modprobe the necessary modules, in my case parport_pc wasn't being loaded automatically, though both parport and lp (once I went back and reconfigured the kernel conf with it!) were loaded when rc.cups (slackware 9.1) ran.

Here is the patch for rc.cups:

--- ./rc.cups.orig 2003-08-25 23:42:39.000000000 +0000
+++ ./rc.cups 2004-08-17 01:17:53.000000000 +0000
@@ -159,6 +159,8 @@

case $1 in
start | restart | reload)
+ modprobe -q parport_pc &>/dev/null
+ modprobe -q lp &>/dev/null
if $IS_ON cups; then
if test "$pid" != ""; then
kill -HUP $pid
@@ -183,6 +185,9 @@
$ECHO_OK
$ECHO "cups: stopped scheduler."
fi
+ modprobe -qr lp &>/dev/null
+ modprobe -qr parport_pc &>/dev/null
+ modprobe -qr parport &>/dev/null
;;

status)
-----snip here-----

Hope this helps someone. It won't help anyone who can already cat a file to /dev/lp0 though, because if you can do that either the modules are already loaded or the kernel has the support built in.