Comment # 8 on bug 1205860 from Johannes Meixner

Some general information:

In general see the section
"Third-Party Scanner Drivers" in
https://en.opensuse.org/SDB:Configuring_Scanners

Regarding HPLIP and its proprietary plugin see the section
"Some devices require a proprietary HPLIP plugin"
and its sub-sections in
https://en.opensuse.org/SDB:How_to_set-up_a_HP_printer


In particular regarding the screenshot in comment #3
https://bugzilla.suse.com/attachment.cgi?id=863780
that shows the same device twice as available via "hpaio"
and as "not configured" in the Yast2 scanner module:

The Yast2 scanner module calls
/usr/lib/YaST2/bin/autodetect_scanners
to autodetect devices which seem to be scanners
which calls sane-find-scanner for SANE scanners
and additionally hp-probe for HPLIP scanners.

The Yast2 scanner module calls
/usr/lib/YaST2/bin/determine_active_scanners
to determine scanners that are available via a SANE driver
which calls scanimage -f '%d,%v,%m;'
that outpouts basically same as scanimage -L

Then some "reasonable effort attempt" is done
in the Yast2 scanner module to find out
which autodetected device is available via a SANE driver.
When that "reasonable effort attempt"
cannot match an autodetected device
to what is reported by scanimage -f '%d,%v,%m;'
(e.g. the model name may not match),
then one same device is reported twice
as already available via a SANE driver
and as not configured autodetected device.