Usually, when you turn off the printer the queue gets disabled and the
state reason gets set to "off or unplugged" and when the printer is
turned on again, the print queue gets re-enabled. This is done to avoid
that CUPS tries to repeat the job regularly generating CPU load by
starting to render the job again and again, which would quickly run down
a laptop's battery when one is on the go and therefore disconnected from
the printer. A laptop user can simply send jobs into the disabled queue
and these jobs get rendered and printed as soon as he is back home.

Perhaps the re-enabling did not happen when you turned on the printer
the last time. Can you try to turn off and turn on your printer several
times to see whether the queue gets disabled when the printer is off and
enabled when the printer is on?

If it does not work, or sometimes not work, try the CUPS package from my
PPA to see whether it gets more reliable then. Its USB backend uses a
newer generation of libusb (the USB access library) and has also some
bugs fixed.

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https://bugs.launchpad.net/bugs/936155

Title:
  Epson Stylus Photo R300 not detected even with 3.0.0-16

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