$OpenBSD: README,v 1.2 2010/12/20 14:43:42 ajacoutot Exp $
Using CUPS under OpenBSD
========================
If you want to print to non-Postscript printers or use CUPS bundled PPD
files (i.e. drivers), you'll need to install ghostscript. You will also
most probably want to install the foomatic-filters package which
provides a universal filter script.
Depending on your printer model you may need to install some driver
package like (non-exhaustive list): hplip, gutenprint, foo2zjs, splix...
This package supports both ulpt(4) and libusb for printing to USB
devices. ulpt(4) should work out of the box, however:
* it needs to claim the entire USB port, so it will not be possible to
access the scanner part of a multi-function device
* ulpt(4) does not support select() which is used by CUPS to know when
the device can accept more data (http://www.cups.org/str.php?L3028)
* it won't be able to automatically detect the corresponding driver/PPD
* it is deprecated upstream in favor of libusb
Required steps for libusb based printing
----------------------------------------
If you choose to make your USB printer use libusb, you'll have to
disable ulpt(4) in your kernel - see config(8) - which will allow libusb
to claim your device.
Since USB printing will be handled by libusb, you need to allow the
_cups user rw access to the corresponding USB endpoint. To do so, find
where your printer is attached to using dmesg(8) then change the
ownerships accordingly.
ugenX = /dev/ugenX
uhubX = /dev/usbX
e.g.
$ dmesg | grep ugen
ugen0 at uhub1 port 1 "EPSON USB MFP" rev 1.10/1.00 addr 2
$ sudo chown _cups /dev/ugen0.* /dev/usb1
The reason we are changing the user and not the group is that it will
allow for multi-function devices to work for both printing and scanning
(e.g. by being owned by _cups:_saned).
To preserve your changes after a system update, use rc.local(8).
e.g. for a multi-function printer/scanner add the following lines:
chown _cups:_saned /dev/ugen0.* /dev/usb1
