thank you Ed,

$ sane-find-scanner I get :
found USB scanner (vendor=0x03f0 [HP], product=0xac11 [*Deskjet 2510 series*])
at libusb:003:006

yes, on my computer it is installed hplip - and I  also tried to run
hp-plugin..
I don't remember if I needed hp-setup for the first installation.

I also tried to reinstall xsane but this wasn't enough (the file of setup
remained) .

xsane worked good for much time as till I made samting wrong ... (in the
setup panel (?))



*I rewrite the content of journalctl...*Aug 25 11:18:04 localhost.pluto
xsane[2791]: *scan/sane/http.c 300: unable to open HP-LEDM-SCAN channel*
Aug 25 11:18:04 localhost.pluto xsane[2791]: *scan/sane/bb_ledm.c 531:
unable to open http connection
hp:/usb/Deskjet_2510_series?serial=CN34B3JGDN05TX*

On Sat, Aug 25, 2018 at 3:30 PM Ed Greshko <ed.gres...@greshko.com> wrote:

> On 08/25/18 17:51, Angelo Moreschini wrote:
> > recently xsane stopped to work on my computer...
> >
> > I don't remember exactly what i did when this happened (perhaps I made
> something of
> > wrong on the panel configuration setting ??).
> >
> > They are several days that I manage to fix this problem.Actually I get
> the error :
> > "xsane error during device I/O failed to open device
> hpaio:/usb/Deskjet..."
>
>
> You don't mention what model of HP printer/scanner you have?  DeskJet
> 2510?
> And did you previously install it using the hp-setup utility?
>
> I have had several HP printer/scanners.  Currently have an OfficeJet Pro
> 8710.  I
> think my previous one was a 6500.  I had both of them set as wireless and
> not USB and
> haven't had a problem with either printing or scanning.
>
> If you did use the hp-setup utility, maybe you should consider deleting
> the devices
> and doing the setup again?
>
> If you think you may have set something in error on the printer maybe you
> can reset
> to defaults?
>
> --
> Conjecture is just a conclusion based on incomplete information. It isn't
> a fact.
>
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