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[dronus <1532582@xxxxxxxxxxxxxxxxxx>]

The problem can be fixed by manually disabling USB autosuspend for the
scanner by doing

echo -1 >/sys/bus/usb/devices/USB_ADDRESS_OF_SCANNER/power/autosuspend

as root.

I guess an udev rule has to be added for that.

However, the scanner would then power on while plugged all the time. So
I guess it would be better if the sane backend would keep the device
open until the scanner slit is retracted to it's home position, and then
close it, allowing autosuspend power off the device.

On the proprietary windows driver, the scanner is kept alive for some
minutes until it is shut down. This is meant to keep the lamp warm which
needs to be preheated after power off I guess.

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https://bugs.launchpad.net/bugs/1532582

Title:
  Regression: SnapScan 1212U stuck after scanning one page

Status in sane-backends package in Ubuntu:
  New

Bug description:
  If I scan a page using the Agfa SnapScan 1212u, the scanner bar does
  not return to the edge but stops in the middle of the scanner at which
  point the scanner powers off.

  If one now tries to do another scan, the motor give a squeeking sound
  for some seconds without movement, and the software reports a
  connection failure.

  If the scanner USB connection is un- and replugged, the slit returns
  to it's home position and it works again.. for one scan.

  Some time ago, the scanner worked fine. I don't know how long this is
  ago.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: libsane 1.0.23-3ubuntu3.1
  ProcVersionSignature: Ubuntu 3.19.0-42.48~14.04.1-generic 3.19.8-ckt10
  Uname: Linux 3.19.0-42-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Jan 10 19:21:08 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-11-22 (49 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  SourcePackage: sane-backends
  UpgradeStatus: No upgrade log present (probably fresh install)

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