Public bug reported:

The error appears after a second try of Preview or scan with an EPSON DS-510 
and Xsane 0.998. At the first try, Xsane returns this message:
It has not been possible to start the scaner. I/O device error.
After the second try, Xsane breaks and the terminal returns this missage:
xsane: handle.cpp:788: std::streamsize sane::handle::start(): Assertion 
«!work_in_progress_» failed.
I've tested the frontend provided by the EPSON driver: imagescan, and it works 
right, and scaning through the command interface works right too:
scanimage -d 
imagescan:usb:esci:/sys/devices/pci0000:00/0000:00:0b.0/usb1/1-1/1-1:1.0 
--format=tiff > output.tif
For this reason, I've rejected a problem in the backend.
Installing the previous version of Xsane (0.996) from the Ubuntu 10.04 packages 
it works right too.

Please, if you need additional information let me know.

Raúl Quiles

** Affects: xsane (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  The error appears after a second try of Preview or scan with an EPSON DS-510 
and Xsane 0.998. At the first try, Xsane returns this message:
  It has not been possible to start the scaner. I/O device error.
  After the second try, Xsane breaks and the terminal returns this missage:
  xsane: handle.cpp:788: std::streamsize sane::handle::start(): Assertion 
«!work_in_progress_» failed.
  I've tested the frontend provided by the EPSON driver: imagescan, and it 
works right, and scaning through the command interface works right too:
  scanimage -d 
imagescan:usb:esci:/sys/devices/pci0000:00/0000:00:0b.0/usb1/1-1/1-1:1.0 
--format=tiff > output.tif
  For this reason, I've rejected a problem in the backend.
  Installing the previous version of Xsane (0.996) from the Ubuntu 10.04 
packages it works right too.
  
  Please, if you need additional information let me know.
+ 
+ Raúl Quiles

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https://bugs.launchpad.net/bugs/1314570

Title:
  xsane: handle.cpp:788: std::streamsize sane::handle::start():
  Assertion «!work_in_progress_» failed.

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