[sane-devel] Bug#993350: Epson Perfection1640: Operation not supported

[ael]

On Sun, Nov 07, 2021 at 08:16:42PM +0100, Wolfram Sang wrote:
> 
> > was too simplistic?
> 
> It is true that the option is not a boolean anymore but an integer. But
> still, if you selet the TPU the old default value for 2.5mm above glass
> (89) should be automatically selected. Without TPU, it should use the
> default of on glass (64).
> 
> I tested this on an Epson 12000XL and Perfection1640.

I have now tested somewhat further without the TPU for now, and I have
hit a few problems.

I started with ridiculously high resolutions, and hit various crashes.
I had to restart both the scanner and xsane. I attach (I hope the list
permits attachments) a screen dump of one such. Of course, one
speculates about a buffer overflow or such, but obviously that is mere
speculation.

I then reduced the area scanned and worked up through resolutions,
so far up to 9600dpi, and I am glad to say they generally worked.
But there was one occasion when I cancelled a scan half way through
(using the [cancel] button) and that crashed. IIRC with "Error during
device I/O". 

So mainly working. Normally, I would not use such high resolutions
(apart from film which I have yet to test).

I am planning to test with the TPU next.

Thanks again for all the work.

ael

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