[sane-devel] "Error during device I/O" with Fujitsu fi65-F (epjitsu backend)

[m. allan noah]

That kind of error implies that we are having a usb problem, where
perhaps a command is being lost, or the data toggle is not being
reset. How old is your git repo checkout? Are you using USB 3 ports?

allan

On Tue, Mar 17, 2015 at 1:34 AM, Jonas Neubert <jonas.neubert at gmail.com> wrote:
> I just did a few successful scans! The patch does indeed make the scanner work, with two caveats:
>
> 1) Only every other call to scanimage results in a successful scan, the 2nd, 4th, 6th, etc scan fails the same way as before.
> 2) Even during successful scans the debug output contains an 'Error during device I/O', although I'm not sure if this is even a problem.
>
> Debug output from a successful scan (1st, 3rd, 5th, ... call to scanimage): https://gist.github.com/jonemo/489414e8bc5590998890
> Debug output from an unsuccessful scan (2nd, 4th, 6th, ... call to scanimage): https://gist.github.com/jonemo/8a4cf7d13a50556b3c41
>
> I also tried scanning at 600dpi and it worked successfully (every other time).
>
> -Jonas
>
> ---- On Mon, 16 Mar 2015 05:26:04 -0700 m. allan noah<kitno455 at gmail.com> wrote ----
>
>  > I have attached a minor patch to the backend. The idea is to send
>  > commands in the same order as the windows driver, starting with get
>  > hardware status. If this does not fix it, I will move on to set
>  > window, which looks like it should be after the initial coarse
>  > calibration payload.
>  >
>  > allan
>  >
>  > On Mon, Mar 16, 2015 at 7:34 AM, m. allan noah <kitno455 at gmail.com> wrote:
>  > > Hmm- the scanner is upset that we tried to send window data. Perhaps
>  > > it wants some other command to be sent first. I will look at your pcap
>  > > again and come up with a patch
>  > >
>  > > allan
>  > >
>  > > --
>  > > "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"
>  >
>
>
>
>



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