As you have noted, the 001:005 refers to the usb device. However this
can change between boots. Did you reboot between the gscan2pdf/scanimage
and epson sessions?
As you can reproduce this from the commandline with scanimage, I am
transferring this bug to sane-backends, as the bug must be in the
epson/epkowa backend in SANE.
"Invalid argument", is simply the error code that libsane returns.
Unfortunately, it does not provide any more information that that by
default.
However, you can run scanimage with debugging turned on. I would ask on
the SANE mailing list for more help.
** Also affects: sane-backends (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/844582
Title:
"Invalid argument" when trying to scan
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