Still not working in Ubuntu 14.01. Situation exactly the same: Simple
Scan sees the scanner and correctly identified it as a Brother ADS-2100,
but when I try to scan something, it says "Failed to scan\Unable to
start scan".

** Changed in: simple-scan (Ubuntu)
       Status: Expired => New

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https://bugs.launchpad.net/bugs/1232016

Title:
  Can't scan from Brother ADS-2100

Status in “simple-scan” package in Ubuntu:
  New

Bug description:
  I'm trying to use my new Brother ADS-2100 double sides document
  scanner with ADF in Ubuntu 13.04 64-bit, but having no luck. Scanimage
  reports that it sees the scanner, but when I try to scan a page it
  says "sane_start: Invalid argument". sane-find-scanner does not report
  seeing the scanner at all. Simple-scan sees the scanner, but gives an
  error message when I try to scan.

  I know the scanner works and the problem is not with the cable or
  something like that, because it works in Windows. I have also tried
  another USB cable.

  The output of "scanimage -L" is:

  device `brother4:bus2;dev1' is a Brother ADS-2100 USB scanner

  The output of "sudo scanimage -L" is the same (but it takes longer). I
  will attach the output of "sane-find-scanner" and "sudo sane-find-
  scanner", but both report not finding *any* USB devices, which is
  strange, because doesn't scanimage also use libsane to find the
  scanner?

  lsusb does find the scanner:

  Bus 003 Device 021: ID 04f9:60a1 Brother Industries, Ltd

  It does not matter which USB port I use (I had it on a hub at first,
  but it doesn't work on two different USB ports on the machine itself
  either).

  Simple-scan does report seeing the scanner (as a "Brother ADS-2100",
  which is correct), but when I try to scan something it works for a
  while and then gives a red error bar saying "Failed to scan/Unable to
  start scan" . I will attach screenshots and the output of "simplescan
  --debug".

  I followed Brother's instructions and installed the brother4 driver
  using the deb from their website
  
(http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/download_scn.html#brscan4_ads),
  as well as the deb they provide for setting the udev rules to allow
  scanning by regular users
  
(http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/instruction_scn1c.html#u13.04).

  I have already tried various potential solutions I found around the
  web:

  * adding lines to /lib/udev/rules.d/40-libsane.rules or 
/lib/udev/rules.d/50-udev-default.rules
  * adding myself to the lp and scanner groups

  None of it seemed to make any difference, and also I think Brother's
  debs already take care of those things. In addition, if the problem
  was with device permissions, scanning would work as root, right?

  Please let me know what other information I can provide or things I
  can try to get to the bottom of this!

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: simple-scan 3.6.1-0ubuntu1
  Uname: Linux 3.11.0-031100-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  Date: Fri Sep 27 15:18:32 2013
  DriverPackageVersions:
   libsane 1.0.23-0ubuntu1
   libsane-extras N/A
   hplip 3.13.3-1ubuntu0.1
   hpoj N/A
  InstallationDate: Installed on 2013-07-31 (57 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Notebook W350STQ/W370ST
  MarkForUpload: True
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-031100-generic 
root=UUID=6ca812df-7fe0-490d-af8c-6cc9758c0d89 ro "acpi_osi=!Windows 2012" 
acpi_backlight=vendor quiet splash vt.handoff=7
  SourcePackage: simple-scan
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/14/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4.6.5
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: W350STQ/W370ST
  dmi.board.vendor: Notebook
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd06/14/2013:svnNotebook:pnW350STQ/W370ST:pvrNotApplicable:rvnNotebook:rnW350STQ/W370ST:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
  dmi.product.name: W350STQ/W370ST
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Notebook

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