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[Martin Dauskardt <md001@xxxxxx>]

This problems exists since months and is still present in 14.10.

For me, it only happens when I use the onboard USB (2.0 or 3.0) of my
mainboard. With an older USB 2.0 PCI card the scanner still works with
sane.

And I can also use the scanner with the onboard USB controller, when I
start Windows XP in VirtualBox , which uses an older USB 2.0 protocol.

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https://bugs.launchpad.net/bugs/1422132

Title:
  Canoscan LIDE 20 (plustek backend) not working anymore

Status in sane-backends package in Ubuntu:
  Incomplete

Bug description:
  I don't know when it happened, but through some upgrade my scanner has
  lost function here.

  There is no movement inside, it only scans a black image. Sometimes,
  rarely I can scan one, but only one image, but directly afterwards it
  gives up again.

  It does not depend on the pc, because I see the same result on three
  different laptops but all with actual Ubuntu 14.04.

  Using a live version of 14.04.1 from July 2014 everything works fine.

  lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS

  apt-cache policy sane
  *** 1.0.14-9 0

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: sane 1.0.14-9
  ProcVersionSignature: Ubuntu 3.13.0-45.74-lowlatency 3.13.11-ckt13
  Uname: Linux 3.13.0-45-lowlatency x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sun Feb 15 17:09:39 2015
  InstallationDate: Installed on 2014-07-27 (202 days ago)
  InstallationMedia: Ubuntu-Studio 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.1)
  SourcePackage: sane-frontends
  UpgradeStatus: No upgrade log present (probably fresh install)

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