After having problems:
"Something wrong happens to hplip after 1.7.1 release"
I tried 2.7.6 release hoping it will fix my issues. Still the same problem. 
Even worse: I can not print at all! hp-toolbox run in user mode returns:

error: Unable to communicate with device (code=12): 
hp:/usb/Deskjet_5900_series?serial=CN6471T0C604KF
warning: Device not found
error: Unable to communicate with device (code=12): 
hp:/usb/Deskjet_5900_series?serial=CN6471T0C604KF
warning: Device not found

however printer is connected and power on.
I use usb 2.0 cable made by HP and bought in HP internet shop together with 
printer.

How can I debug this problem?

I use libusb 0.1.12
KDE info center in USB devices report this:
Deskjet 5900 series
Manufacturer: HP
Serial #:CN6471T0C604KF
Class 0 ((Defined at Interface level))
Subclass: 0
Protocol: 0
USB version: 2.00
Provider ID: 0x3f0
Product ID: 0x8704
Errata: 1.00
Speed: 12 Mbit/s
Channels: 0
Max packet size: 0

/var/log/messages reports this:
Jun 23 10:20:20 x-power python: io/hpmud/musb.c 966: unable to open 
hp:/usb/Deskjet_5900_series?serial=CN6471T0C604KF
Jun 23 10:20:20 x-power python: hp-toolbox[4314] error: Unable to communicate 
with device (code=12): hp:/usb/Deskjet_5900_series?serial=CN6471T0C604KF

Jun 23 12:18:45 x-power Deskjet_5900_series?serial=CN6471T0C604KF: INFO: open 
device failed; will retry in 30 seconds...
Jun 23 12:19:48 x-power Deskjet_5900_series?serial=CN6471T0C604KF: 
io/hpmud/musb.c 512: invalid product id string: Operation not permitted
Jun 23 12:19:48 x-power Deskjet_5900_series?serial=CN6471T0C604KF: 
io/hpmud/musb.c 966: unable to open 
hp:/usb/Deskjet_5900_series?serial=CN6471T0C604KF

Now this bug is very serious. I really would like to help you in debugging 
problem. Please give me directions where I can start loking and which tools I 
should use. Which reports you would like to see?

Zbigniew Luszpinski
hp-check[11513]: info: :
hp-check[11513]: info: :---------------
hp-check[11513]: info: :| SYSTEM INFO |
hp-check[11513]: info: :---------------
hp-check[11513]: info: :
hp-check[11513]: info: :[01mBasic system information:[0m
hp-check[11513]: info: :Linux x-power 2.6.21.5 #1 Tue Jun 12 23:15:34 CEST 2007 i686 GNU/Linux
hp-check[11513]: info: :
hp-check[11513]: info: :[01mDistribution:[0m
hp-check[11513]: info: :unknown 0.0
hp-check[11513]: info: :[01m
HPOJ running?[0m
hp-check[11513]: info: :No, HPOJ is not running (OK).
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking Python version...[0m
hp-check[11513]: info: :OK, version 2.5.1 installed
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking PyQt version...[0m
hp-check[11513]: info: :OK, version 3.17 installed.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking SIP version...[0m
hp-check[11513]: info: :OK, Version 4.6 installed
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for CUPS...[0m
hp-check[11513]: info: :Status: planista jest uruchomiony
hp-check[11513]: info: :Version: 1.2.11
hp-check[11513]: info: :
hp-check[11513]: info: :----------------
hp-check[11513]: info: :| DEPENDENCIES |
hp-check[11513]: info: :----------------
hp-check[11513]: info: :
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency cups - Common Unix Printing System...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency cups-devel- Common Unix Printing System development files...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency gcc - GNU Project C and C++ Compiler...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency GhostScript - PostScript and PDF language interpreter and previewer...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency libcrypto - OpenSSL cryptographic library...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency libjpeg - JPEG library...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency libnetsnmp-devel - SNMP networking library development files...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency libpthread - POSIX threads library...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency libusb - USB library...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency make - GNU make utility to maintain groups of programs...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency ppdev - Parallel port support kernel module....[0m
hp-check[11513]: warn: :NOT FOUND! This is an OPTIONAL dependency. Some HPLIP functionality may not function properly.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency PyQt - Qt interface for Python...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency python-devel - Python development files...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency Python 2.3 or greater - Required for fax functionality...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency Python 2.2 or greater - Python programming language...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency Reportlab - PDF library for Python...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency sane - Scanning library...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency sane-devel - Scanning library development files...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency scanimage - Shell scanning program...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking for dependency xsane - Graphical scanner frontend for SANE...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :
hp-check[11513]: info: :----------------------
hp-check[11513]: info: :| HPLIP INSTALLATION |
hp-check[11513]: info: :----------------------
hp-check[11513]: info: :
hp-check[11513]: info: :
hp-check[11513]: info: :[01mCurrently installed HPLIP version...[0m
hp-check[11513]: info: :HPLIP 2.7.6 currently installed in '/usr/share/hplip'.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mCurrent contents of '/etc/hp/hplip.conf' file:[0m
hp-check[11513]: info: :# hplip.conf.  Generated from hplip.conf.in by configure.

[hpssd]
# Note: hpssd does not support dynamic ports
# Port 2207 is the IANA assigned port for hpssd
port=2207

[hplip]
version=2.7.6

[dirs]
home=/usr/share/hplip
run=/var/run
ppd=/usr/share/ppd/HP
ppdbase=/usr/share/ppd
doc=/usr/share/doc/hplip-2.7.6
icon=/usr/share/applications
cupsbackend=/usr/lib/cups/backend
foomatic=/usr/share/foomatic

# Following values are determined at configure time and cannot be changed.
[configure]
network-build=no
pp-build=yes
gui-build=yes
scanner-build=yes
fax-build=yes
cups11-build=no
doc-build=yes
shadow-build=yes
foomatic-xml-install=yes
foomatic-ppd-install=yes
internal-tag=2.7.6.13

hp-check[11513]: info: :
hp-check[11513]: info: :----------------------
hp-check[11513]: info: :| INSTALLED PRINTERS |
hp-check[11513]: info: :----------------------
hp-check[11513]: info: :
hp-check[11513]: info: :
hp-check[11513]: warn: :No queues found.
hp-check[11513]: info: :
hp-check[11513]: info: :----------------------
hp-check[11513]: info: :| SANE CONFIGURATION |
hp-check[11513]: info: :----------------------
hp-check[11513]: info: :
hp-check[11513]: info: :[01m'hpaio' in '/etc/sane.d/dll.conf'...[0m
hp-check[11513]: info: :OK, found. SANE backend 'hpaio' is properly set up.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking output of 'scanimage -L'...[0m
hp-check[11513]: info: :
No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).

hp-check[11513]: info: :
hp-check[11513]: info: :---------------------
hp-check[11513]: info: :| PYTHON EXTENSIONS |
hp-check[11513]: info: :---------------------
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking 'cupsext' CUPS extension...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking 'pcardext' Photocard extension...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking 'hpmudext' I/O extension...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking 'scanext' SANE scanning extension...[0m
hp-check[11513]: info: :OK, found.
hp-check[11513]: info: :
hp-check[11513]: info: :
hp-check[11513]: info: :-----------------
hp-check[11513]: info: :| USB I/O SETUP |
hp-check[11513]: info: :-----------------
hp-check[11513]: info: :
hp-check[11513]: info: :[01mChecking proper HPLIP I/O setup (USB I/O only)...[0m
hp-check[11513]: info: :udev "usb_device" access mode: 0664 (OK)
hp-check[11513]: info: :
hp-check[11513]: info: :[01mIs user 'zbyszek' a member of the 'lp' group?[0m
hp-check[11513]: info: :Yes (OK)
hp-check[11513]: info: :
hp-check[11513]: info: :
hp-check[11513]: info: :-----------
hp-check[11513]: info: :| SUMMARY |
hp-check[11513]: info: :-----------
hp-check[11513]: info: :
hp-check[11513]: error: :1 error or warning.
hp-check[11513]: info: :
hp-check[11513]: info: :Please refer to the installation instructions at:
hp-check[11513]: info: :http://hplip.sourceforge.net/install/index.html

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