[sane-devel] Canon MX430 / MX510 / MX925 - does not recover when ADF out of paper

[Matthias Peter Walther]

Hallo Rolf,

that one screwed it. The scanner scans the first page, starts loading
the second one and aborts. See the attached log. I inserted 3 papers as
usual.

The image size is 638x1050 (standard resolution, I think that is 75 or
150(?)). The image is in relation much higher than wide as a standard
German DinA4 paper now, but the filled/scanned area is exact the same,
last 1mm is still missing and the rest is plain, digital white. I think
there might be a maximum hight the firmware of the scanner can handle in
adf mode. How can we smartly test that? Or do we have to do that by hand?

There's another adf related iussue: If something goes wrong with the
hardware/pulling in of the papers, sane aborts and gets status 9. The
only way to get the device out of this and to work again, is to restart
the device or to once load the binary and close it. Could you look into
there, if there is a command to reset the scanner somehow? See second
log attached, tested with patch1+2 only.


Bye
Matthias


Am 18.03.2014 22:39, schrieb Rolf Bensch:
> Hi,
>
> Am 18.03.2014 00:16, schrieb Matthias Peter Walther:
>> scan passes through, and it is possible to do multiple scans in a row.
>> Also tested with resolution 300.
>>
> This is a good message.
>
>> Two issues:
>>
>>  - image is too width (binary detects page width somehow automatically)
> It seems so, but binary does!
>
> Binary image is 2479 pixels wide and pixma has 2552 pixels. It seems
> that binary crops image width to hide ADF frame and pixma doesn't.
>
>>  - image not high enough, last 1-1.5 mm of the page are missing. But
>> this is the same with the binary package from canon. See that white
>> stripe at the end.
>>
> It seems that ADF cannot scan whole page length. Binary crops here, too.
> Pixma saves the expected image height of 3508 pixels.
>
> You can investigate this behaviour @ 75 dpi, if you like. Otherwise you
> can set the scan size (x, y positions and width, height) in the frontend
> to crop ADF frames by yourself.
>
> I prepared a new patch with these fixes (based on patch 2):
> (1) remove s->param->adf_pageid to avoid doubled coded functions.
> (2) all ADF scanners support 14" legal paper size in ADF mode, but only
> A4 in flatbed mode.
>
> Please test this patch again and try to use it in your productive work.
>
> If everything is OK, I'll commit this patch and we can close the ADF
> paper empty issue.
>
> Many thanks for your help.
>
> Cheers,
> Rolf