same thing here with canon lbp-810, working but dmesg :

[ 7909.084000] audit(1191861958.444:4):  type=1503 operation="inode_permission" 
requested_mask="a" denied_mask="a" name="/dev/tty" pid=16995 
profile="/usr/sbin/cupsd"
[ 7972.484000] usb 1-1: new full speed USB device using ohci_hcd and address 4
[ 7972.696000] usb 1-1: configuration #1 chosen from 1 choice
[ 7972.744000] 
/build/buildd/linux-source-2.6.22-2.6.22/drivers/usb/class/usblp.c: usblp0: USB 
Bidirectional printer dev 4 if 0 alt 0 proto 2 vid 0x04A9 pid 0x260A
[ 7972.744000] usbcore: registered new interface driver usblp
[ 7972.744000] 
/build/buildd/linux-source-2.6.22-2.6.22/drivers/usb/class/usblp.c: v0.13: USB 
Printer Device Class driver
[ 8837.452000] audit(1191862886.996:5):  type=1502 operation="inode_permission" 
requested_mask="w" denied_mask="w" name="/var/ccpd/fifo0" pid=17843 
profile="/usr/sbin/cupsd"

# Printer configuration file for CUPS v1.3.2
# Written by cupsd on 2007-10-08 18:45
<Printer LBP-810>
Info Canon LBP-810
DeviceURI ccp:/var/ccpd/fifo0
State Idle
StateTime 1191604118
Accepting Yes
Shared Yes
JobSheets none none
QuotaPeriod 0
PageLimit 0
KLimit 0
OpPolicy default
ErrorPolicy retry-job
</Printer>

-- 
[Gutsy] Canon LBP-810 / LBP-1120 :  "Can't open FIFO: Permission denied"
https://bugs.launchpad.net/bugs/148173
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