Public bug reported:

Hardware/software used:

Epson BX635FWD printer/scanner over wi-fi connection  - firmware: KR27BB 57.57
Ubuntu 12.04 LTS
libsane-epkowa.so.1.0.15
gscan2pdf 0.9.32

Image Scan! for Linux also installed on machine (from 
http://download.ebz.epson.net/dsc/search/01/search/?OSC=LX)
iscan_2.28.1-3.ltdl7
iscan-network-nt-1.1.0-2

Description of problem:

gscan2pdf connects to the scanner fine and (correctly) shows options of

[Scan source] = "Flatbed"/"Automatic document feeder"
[ADF Mode] = "Simplex"/"Duplex"

under "Optional equipment" tab. However, when "Automatic document
feeder" and "Duplex" are selected, "Page Options" tab gives only the
options of

[Side to scan] = "Facing"/"Reverse"

- there is no "Both" option to scan both sides, even when [Source
document] = "Double sided" is selected.

Resultant behaviour when scanning using ADF Duplex mode is that both
sides are scanned, but reverse pages come out 180 degrees inverted.
Changing post-processing options does not correct this as gscan2pdf
seemingly does not differentiate between the facing/reverse pages from
epkowa's output. The only fix at present seems to be to manually correct
the output each time.

** Affects: gscan2pdf (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1001208

Title:
  gscan2pdf not recognising ADF duplex mode with Epson epkowa library

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