[sane-devel] scanbd daemon does not load firmware

Wilhelm wilhelm.meier at fh-kl.de
Thu Aug 29 13:33:51 UTC 2013

Hi Ilja,

Am 29.08.2013 15:25, schrieb Ilya V. Ivanchenko:
> Hi Wilhelm,
> *>*is there a special reason using the (old) scanbuttond-backends and not
> I first tried sane-backends, and apparently it does not read the buttons
> for Epson GT-1500.

did you use the epkowa backend? The sane-support-page says, that this 
backend supports most features of the GT-1500.

> I tried various things with sane-backends, but
> "scanimage -A" gives no button options and it was very unclear how to
> patch sane-backends or even where to start. So I quickly gave up and
> moved to scanbuttond-backends where it was easy to figure out a patch
> and it worked right away. I'd be glad if sane backend worked, but even
> Epson's iscan does not support buttons (seemingly on any of their scanners).
>>If you plugin / poweron the scanner for the first time, who does the
>>firmware get loaded in this case?
> Good question. Now retracing my steps backwards, I think I got
> iscan+sane to load the drivers the very first time and I did not notice
> this problem. When I tested things, I always used "scanimage -L" as a
> quick test, and it pulled the string up to the firmware loading (at
> which moment scanner clearly does a whizz sound moving the head in its
> POST). It appears to me that scanbd somehow misses calling the firmware
> load on USB insert (before reading buttons), but does it on scanimage
> -L. Perhaps it is due to the use of scanbuttond-backends and not
> sane-backends.
> So my current conclusions are that there are two potential issues to fix:
>   1. Make sane-backends support buttons that scanbuttond-backends support.

that would be the best choice, since I have no real plans to support the 
scanbuttond backends.

>   2. When using scanbuttond-backends, fix loading firmware on USB insert.

what I could imagine is to fix this problem with a special 
shell-callback, when scanbd detects a device inserion / removal.

> Please correct me if I'm wrong here.
> --
> Wilhelm
> w.meier at unix.net <mailto:w.meier at unix.net>

w.meier at unix.net

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