The Printer detection for USB printer is as follow:
[EMAIL PROTECTED]:~$ lsmod | grep usb
usblp                  15872  0
usbcore               146028  4 usblp,ehci_hcd,ohci_hcd
[EMAIL PROTECTED]:~$ tail -f /var/log/messages
Jun  3 19:43:07 LinuxXP -- MARK --
Jun  3 20:03:07 LinuxXP -- MARK --
Jun  3 20:23:07 LinuxXP -- MARK --
Jun  3 20:43:07 LinuxXP -- MARK --
Jun  3 20:44:23 LinuxXP kernel: [ 9722.908549] usb 3-2: new high speed USB 
device using ehci_hcd and address 3
Jun  3 20:44:24 LinuxXP kernel: [ 9723.042617] usb 3-2: configuration #1 chosen 
from 1 choice
Jun  3 20:44:24 LinuxXP kernel: [ 9723.628331] usblp0: USB Bidirectional 
printer dev 3 if 0 alt 0 proto 2 vid 0x04A9 pid 0x10A2
Jun  3 20:44:24 LinuxXP kernel: [ 9723.628956] usbcore: registered new 
interface driver usblp
Jun  3 20:46:26 LinuxXP kernel: [ 9845.657216] usb 3-2: USB disconnect, address 
3
Jun  3 20:46:26 LinuxXP kernel: [ 9845.657513] usblp0: removed
Jun  3 20:46:58 LinuxXP kernel: [ 9877.186066] usb 3-2: new high speed USB 
device using ehci_hcd and address 4
Jun  3 20:46:58 LinuxXP kernel: [ 9877.320674] usb 3-2: configuration #1 chosen 
from 1 choice
Jun  3 20:46:58 LinuxXP kernel: [ 9877.335579] usblp0: USB Bidirectional 
printer dev 4 if 0 alt 0 proto 2 vid 0x04A9 pid 0x10A2

[EMAIL PROTECTED]:~$ lpinfo -v
network socket
network beh
direct 
hal:///org/freedesktop/Hal/devices/usb_device_4a9_10a2_353EE3_if0_printer_noserial
direct usb://Canon/iP4200
direct canon:/dev/usb/lp0
direct hpfax
direct hp
network http
network ipp
network lpd
direct parallel:/dev/lp0
file cups-pdf:/
direct scsi
network smb


** Attachment added: "printingbuginfo"
   http://launchpadlibrarian.net/14967037/printingbuginfo

-- 
Canon IP4200 not printing anymore after upgrade to 8.04
https://bugs.launchpad.net/bugs/236623
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