An other feedback with a c4585 here running on vivid and/or utopic/precise i386:
- same issue as described
- i get around by unplug/plug the usb cord

so im thinking about how the 'usb' device is monitored:
- at the login session (gnome-shell here) the hp printer is well identified 
(icon in the systray for a few seconds then disappear)
- when a print job is sent later, the printer does not awake: need to 
unplug/plug the usb cord, then i need to reload the printing job, choose the 
printer, then the job is done. But then the printer is again deactivated and 
the next print job needs the previous workaround.

That is; so as i understand, sending a print job SHOULD also first
reinitiate the device to make it active. Is it a
udev/systemd/script/else missing/not implemented mandatory job ? (seems
not be a hplip issue per se)


** Tags added: utopic vivid

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https://bugs.launchpad.net/bugs/241781

Title:
  hp photosmart 7450 communication problems.

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