Here are the results on my Intrepid box:

t...@till-desktop:~$ lsusb
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 004: ID 058f:6362 Alcor Micro Corp. Hi-Speed 21-in-1 Flash Card 
Reader/Writer (Internal/External)
Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 004: ID 03f0:bd02 Hewlett-Packard Photosmart Pro B9100 series
Bus 006 Device 003: ID 03f0:3517 Hewlett-Packard LaserJet 3390
Bus 006 Device 002: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 010: ID 046a:0011 Cherry GmbH 
Bus 005 Device 005: ID 045e:0040 Microsoft Corp. Wheel Mouse Optical
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
t...@till-desktop:~$ ll /dev/bus/usb/*/*
crw-rw-r--  1 root root    189,   0 2009-01-02 20:50 /dev/bus/usb/001/001
crw-rw-r--  1 root root    189, 128 2009-01-02 20:50 /dev/bus/usb/002/001
crw-rw-r--  1 root root    189, 256 2009-01-02 20:50 /dev/bus/usb/003/001
crw-rw-r--  1 root root    189, 384 2009-01-02 20:50 /dev/bus/usb/004/001
crw-rw-r--  1 root root    189, 512 2009-01-02 20:50 /dev/bus/usb/005/001
crw-rw-r--  1 root root    189, 516 2009-01-02 20:50 /dev/bus/usb/005/005
crw-rw-r--  1 root root    189, 521 2009-01-16 12:20 /dev/bus/usb/005/010
crw-rw-r--  1 root root    189, 640 2009-01-02 20:50 /dev/bus/usb/006/001
crw-rw-r--  1 root root    189, 641 2009-01-18 01:25 /dev/bus/usb/006/002
crw-rw-r--+ 1 lp   scanner 189, 642 2009-01-18 01:25 /dev/bus/usb/006/003
crw-rw-r--+ 1 lp   scanner 189, 643 2009-01-18 01:25 /dev/bus/usb/006/004
crw-rw-r--  1 root root    189, 768 2009-01-02 20:50 /dev/bus/usb/007/001
crw-rw-r--  1 root root    189, 771 2009-01-02 20:50 /dev/bus/usb/007/004
t...@till-desktop:~$ udevadm info -qall -n /dev/bus/usb/006/003
P: /devices/pci0000:00/0000:00:1d.2/usb6/6-2/6-2.1
N: bus/usb/006/003
S: char/189:642
t...@till-desktop:~$ udevadm info -qall -n /dev/bus/usb/006/004
P: /devices/pci0000:00/0000:00:1d.2/usb6/6-2/6-2.4
N: bus/usb/006/004
S: char/189:643
t...@till-desktop:~$ 

In Intrepid HP devices get assigned lp.scanner. In Jaunty the scanner
group does not exist anymore (or is at least not used any more). In
Jaunty ALL (not only HP) printers should get these files assigned to
lp.lp with 664 permissions.

-- 
/dev/bus/usb/*/* files (device nodes for libusb) of printers must be readble 
and writable for user "lp"
https://bugs.launchpad.net/bugs/318262
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