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

[m. allan noah]

On Wed, Jan 14, 2026 at 9:33 AM Simon Matter <simon.matter at invoca.ch> wrote:

> Hi Allan
>
> > I suspect the scanner may be going to sleep. Some older models had
> > problems
> > waking up. Questions:
> >
> > 1. what other model scanners have the problem?
>
> For now I was only able to try fi-7160 and fi-7260.
>
> > 2. how long do you wait between scans when this happens?
>
> Only seconds.
>
> > 3. if you press a button on the scanner before you scan, does the problem
> > happen?
>
> Yes happens also.
>
> > 4. Have you tried another computer?
>
> Yes, but same model so same USB configuration.
>
> >
> > if you want, you could gather some logs and send them to me.
> >
> > SANE_DEBUG_FUJITSU=15 scanimage [your parameters here] 2>7160.log
>
> The log is from when the scanner is not seen anymore but still shown in
> lsusb. I'm afraid that's not what you wanted?
>
>
Actually, this log is interesting- could you try again with the same state,
but increase debugging to 35?

Also, I wonder if the kernel is producing any usb related errors when this
happens? Perhaps dmesg might show something?

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