[sane-devel] Unstable scanning with Fujitsu fi-7160

[m. allan noah]

What changed? Just the sane-backends version, or anything else (hardware,
OS, etc)

allan

On Wed, Jan 14, 2026 at 2:32 PM Simon Matter <simon.matter at invoca.ch> wrote:

> I can confirm now that the problem is with the button daemon
> scanmonitord-sanebd only and not with scanimage.
>
> When I run "SANE_DEFAULT_DEVICE=fujitsu:fi-7160:42929 scanmonitord-sanebd"
> several times in a terminal and terminate it with Ctrl+C, it will suddenly
> say "Open of device fujitsu:fi-7160:42929 failed: Invalid argument".
> While studying the code of scanmonitord-sanebd.c I'm failing to understand
> what could be wrong. This has worked fine with SANE backends 1.0.24 but
> something has changed here.
>
> If anyone has an idea what could be wrong, please let me know. I'm quite
> lost here.
>
> Thanks,
> Simon
>
> > I start to believe the problem is not in SANE itself but in the button
> > daemon we are using (see attachement).
> >
> > Our software is running the button daemon and waits for events, then
> > terminates the button daemon and does the appropriate scanimage job, and
> > then starts the button daemon again.
> >
> > The button daemon is a modified version of some daemon which was floating
> > around many years ago. It has worked well for the last 15 years or so.
> > Maybe there is some modification needed to make it work well with newer
> > SANE.
> >
> > If someone who knows SANE better than me would take a look at it, that
> > would be much appreciated.
> >
> > Thanks,
> > Simon
> >
> >> We need to isolate the problem if possible- I expect if you compile an
> >> older, known working sane-backends on your current computer, the problem
> >> will persist. That would indicate hardware or OS level issue.
> >>
> >> allan
> >>
> >> On Wed, Jan 14, 2026 at 9:35 AM Simon Matter via sane-devel <
> >> sane-devel at alioth-lists.debian.net> wrote:
> >>
> >>> >
> >>> > Hello,
> >>> >
> >>> > On 2026-01-14 14:59, Simon Matter via sane-devel wrote:
> >>> >> These scanners work perfectly fine with very old sane-backends
> >>> >> and operating system.
> >>> >
> >>> > Does it work on the exact same computer
> >>> > where it fails or does it work on old computers?
> >>>
> >>> It works fine on old computers with old software.
> >>>
> >>> >
> >>> > I ask because of possible USB 3 related issues, see
> >>> > https://en.opensuse.org/SDB:Configuring_Scanners#USB
> >>>
> >>> Thanks, I'll check it out.
> >>>
> >>> Simon
> >>>
> >>>
> >>>
> >>
> >> --
> >> "well, I stand up next to a mountain- and I chop it down with the edge
> >> of
> >> my hand"
> >>
> >
>
>
>

-- 
"well, I stand up next to a mountain- and I chop it down with the edge of
my hand"
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