w8@w8-FJ463AAR-ABA-a6528p:~$ sudo rmmod usblp
[sudo] password for w8: 
ERROR: Module usblp does not exist in /proc/modules
w8@w8-FJ463AAR-ABA-a6528p:~$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 04b4:6830 Cypress Semiconductor Corp. CY7C68300A EZ-USB AT2 USB 2.0 to ATA/ATAPI
Bus 001 Device 004: ID 067b:3507 Prolific Technology, Inc. PL3507 ATAPI6 Bridge
Bus 001 Device 005: ID 058f:6377 Alcor Micro Corp. Multimedia Card Reader
Bus 002 Device 002: ID 050d:0002 Belkin Components 
Bus 001 Device 006: ID 0951:1603 Kingston Technology DataTraveler 1GB/2GB Pen Drive
w8@w8-FJ463AAR-ABA-a6528p:~$ ls -l /dev/bus/usb/*/*
crw-rw-r-- 1 root root 189,   0 2012-01-18 19:19 /dev/bus/usb/001/001
crw-rw-r-- 1 root root 189,   2 2012-01-18 19:19 /dev/bus/usb/001/003
crw-rw-r-- 1 root root 189,   3 2012-01-18 19:19 /dev/bus/usb/001/004
crw-rw-r-- 1 root root 189,   4 2012-01-18 19:19 /dev/bus/usb/001/005
crw-rw-r-- 1 root root 189,   5 2012-01-18 11:20 /dev/bus/usb/001/006
crw-rw-r-- 1 root root 189, 128 2012-01-18 19:19 /dev/bus/usb/002/001
crw-rw-r-- 1 root lp   189, 129 2012-01-18 19:19 /dev/bus/usb/002/002
w8@w8-FJ463AAR-ABA-a6528p:~$ ls -l /dev/usb/lp*
ls: cannot access /dev/usb/lp*: No such file or directory
w8@w8-FJ463AAR-ABA-a6528p:~$ sudo /usr/lib/cups/backend/usb
DEBUG: list_devices
DEBUG: libusb_get_device_list=7
direct usb://Unknown/Model "/Model" "/Model" "" ""
w8@w8-FJ463AAR-ABA-a6528p:~$ ldd /usr/lib/cups/backend/usb | grep usb
	libusb-1.0.so.0 => /lib/i386-linux-gnu/libusb-1.0.so.0 (0x00b48000)
w8@w8-FJ463AAR-ABA-a6528p:~$ lpinfo -v
network socket
network ipp
network http
network lpd
direct parallel:/dev/lp0
direct scsi
network smb
network beh
direct usb://Unknown/Model
direct hp
direct hpfax
direct parallel:/dev/lp1
w8@w8-FJ463AAR-ABA-a6528p:~$ sudo modprobe usblp
w8@w8-FJ463AAR-ABA-a6528p:~$ lsmod | grep usb
usblp                  17833  0 
usb_storage            44173  12 ums_cypress
w8@w8-FJ463AAR-ABA-a6528p:~$ sudo usb_printerid /dev/usb/lp0
Error: No such file or directory: can't open '/dev/usb/lp0'
w8@w8-FJ463AAR-ABA-a6528p:~$ sudo rmmod usblp
w8@w8-FJ463AAR-ABA-a6528p:~$