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.
** Attachment added: "Running hp check without printing" https://bugs.launchpad.net/ubuntu/+source/hplip/+bug/1247227/+attachment/3978588/+files/hpcheck001.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1247227 Title: Using a HP Officejet 4500g Desktop, I have to print an empty page to be able to use it in scan mode To manage notifications about this bug go to: https://bugs.launchpad.net/hplip/+bug/1247227/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
