[sane-devel] Epson Perfection1640: Testing TPU

[ael]

On Sun, Nov 07, 2021 at 08:16:42PM +0100, Wolfram Sang wrote:
> 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.
> 
> Please check if that works on your system as well.

I have been exploring further and discovered that xsane works with
the TPU *only* if the Film type in the Advanced options is set
to Positive Film or Negative film. It gives the previously reported
"Invalid argument" if set to "Positive Slide" or "Negative Slide".

So TPU works with Film but not Slides. Is this a backend problem?

I hope that is enough to track this down. If not is there a debug
option I can set somewhere, or maybe I should reach for gdb?
I hope the Makefile has a gbd symbol target.

ael