That 'auto' string is put there by scanimage, when it finds an option
with the SANE_CAP_AUTOMATIC capability set. Unfortunately, scanimage
has some special handling for the x/y/t/l parameters. It appears that
-l and -t will properly parse the 'auto' string, but -x and -y will
not. This is a bug in
Nobody? I found this old discussion which seems to suggest the pixma devices
don't support auto-detection:
http://lists.alioth.debian.org/pipermail/sane-devel/2009-December/025674.html
If that's indeed the case, may I suggest updating the pixma backend so that it
doesn't advertise capabilities
I'm using saned with a Pixma MP610 all-in-one on a Raspberry Pi 3
running an up-to-date Rasbian Jessie. scanimage --help shows me the
following options for Geometry:
[...]
Options specific to device `net:localhost:pixma:04A91725_414EE7':
[...]
Geometry:
-l auto|0..216.069mm [0]
