Using a HP Officejet 4500g Desktop, I have to print an empty page to be able to use it in scan mode

[Nagy Tamás]

Using a HP Officejet 4500g Desktop, I have to print an empty page to be able to use it in scan mode.
Otherwhere else nothing happens.

With 13.04 it worked perfectly.

Now with 13.10 I have to print an empty page to switch between printing and scanning modes.

XSane simply does not recognize a scanner.
After printint a page, it recognizes it like before with 13.04

$ apt-cache policy cups
cups:
  Installed: 1.7.0~rc1-0ubuntu5
  Candidate: 1.7.0~rc1-0ubuntu5
  Version table:
 *** 1.7.0~rc1-0ubuntu5 0
        500 http://mirror.switch.ch/ftp/mirror/ubuntu/ saucy/main amd64 Packages
        100 /var/lib/dpkg/status

 lsb_release -rd
Description: Ubuntu 13.10
Release: 13.10

[Till Kamppeter (till-kamppeter)]

Please follow the instructions of the sections "CUPS error_log" on https://wiki.ubuntu.com/DebuggingPrintingProblems. Also run the command

sudo hp-check -r

in a terminal window and post the output here.

Please do not compress or package together any files which you are attaching.

[Launchpad Janitor (janitor)]

[Expired for hplip (Ubuntu) because there has been no activity for 60 days.]

[Nagy Tamás (ngy-tms)]

I realized, that I don't have to reboot the machine.

If xscan cannot find scanner devices, it is enough to "suspend" the laptop.
After waking up again xscan will find the scanner.

[Nagy Tamás (ngy-tms)]

Today it was again out of order. Log attached: when scanner not found.