I already asked this on sane-devel. Olaf's response:

> > If 2CV67's numbers are correct that answer is not completly correct.
> >
> > Epson Perfection V200 scanimage
> >     --resolution 300|2400|4800dpi [300]
> >         Sets the resolution of the scanned image.
> >     --x-resolution 75|300|600|1200|2400|4800dpi [300]
> >         Sets the horizontal resolution of the scanned image.
> >     --y-resolution 
> > 100|200|300|400|600|800|1200|1800|2400|3600|4800|6600|9600dpi [300]
> >
> > The intersection would be 300|600|1200|2400|4800 but 600 and 1200 are
> > missing from the list generated by scanimage.
Good catch.  My explanation was not quite complete.

If you try the help with --source="Transparency Unit", you should see
slightly different lists of --x-resolution and y-resolution values.  The
list of --resolution values is the intersection of these lists and those
above.

Hope this helps,

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https://bugs.launchpad.net/bugs/984974

Title:
  Simple scan update broke communication

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