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[Nathanaël Naeri <1442111@xxxxxxxxxxxxxxxxxx>]

I forgot to mention, but when this problems appears, unplugging and
replugging the scanner (or switching it off and on) does not make the
problem go away, as far as I have noticed. Only rebooting sometimes make
things work.

Updated SANE from 1.0.22 (-7ubuntu1) to 1.0.25 (-git20150516-precise0)
using Rolf Bensch's PPA (daily git snapshots,
https://launchpad.net/~rolfbensch/+archive/ubuntu/sane-git). Now
scanimage also reports an epson2 scanner besides the epkowa scanner. I
believe this is because support for Epson Stylus Office BX305FW has been
added in backend epson2 in SANE 1.0.25, according to the lists of
supported devices available on the SANE website. Epson IScan has not
changed, same version as reported.

The reported behavior is still present (and still only on some boots, as
reported).

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https://bugs.launchpad.net/bugs/1442111

Title:
  Scanner is correctly identified but scan fails with "sane_start:
  Invalid argument" as root, and rebooting the computer sometimes makes
  things work, sometimes not

Status in sane-backends package in Ubuntu:
  New

Bug description:
  OS/Kernel: Ubuntu 12.04.5 LTS (GNU/Linux 3.2.0-80-generic x86_64)
  Scanner: Epson Stylus Office BX305FW, USB 2.0, id 0x04b8/0x0863
  SANE: libsane_1.0.22-7ubuntu1, libsane-common_1.0.22-7ubuntu1, sane-utils_1.0.22-7ubuntu1 (up-to-date 12.04 LTS)
  Epson IScan: iscan_2.30.1-1, iscan-data_1.36.0-1 (latest versions, 2015-03-23)

  The scanner is correctly identified, when logged in as root:

    # sane-find-scanner
    found USB scanner (vendor=0x04b8, product=0x0863) at libusb:001:004
    # lsusb
    Bus 001 Device 004: ID 04b8:0863 Seiko Epson Corp.
    # scanimage -L
    device `epkowa:usb:001:004' is a Epson Stylus Office BX305F/BX305FW/TX320F/ME OFFICE 620F/WorkForce 320 Series flatbed scanner

  But scan fails with "scanimage: sane_start: Invalid argument"
  (scanimage frontend) or "Échec de la numérisation: Impossible de
  démarrer la numérisation" (simple-scan frontend):

    # scanimage -d epkowa:usb:001:004 -v -T
    scanimage: sane_start: Invalid argument

  The permissions of the device seem nominal:

    # ls -l /dev/bus/usb/001/004
    crw-rw-r--+ 1 root lp 189, 1 avril  9 12:32 /dev/bus/usb/001/004

  And the following line is present in /lib/udev/rules.d/40-iscan.rules:

    ATTRS{idVendor}=="04b8", ATTRS{idProduct}=="0863",
  ENV{libsane_matched}="yes"

  When this problems appears, it stays so for the whole session, but
  rebooting the computer sometimes makes the problem go away, sometimes
  not. The only thing I can see that a reboot changes is the USB device
  ID, all the rest stays the same in the previous commands output.

  For instance right now the USB device ID was 001:004 and scan wasn't
  working, I rebooted and it's 001:002 and scan is working. I don't know
  if it is relevant, I don't understand what is causing the problem, and
  I don't know how to investigate further.

  SANE support for this scanner with external backend epkowa is normally
  complete, and everything runs smoothly on the reboots when the problem
  does not appear. Any help is appreciated. Should I report the bug
  upstream, or against a different package, perhaps a USB-related or
  boot-related one?

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