[sane-devel] porting to 64 bit issue

[Gérard van der Veen]

I entered a bug in the tracker and got a comment by Paul Menzel 
<https://alioth.debian.org/users/paulepanter-guest/>:
"I think the tracker is not used a lot anymore by the current developers.
Please bring your issue up to the sane-devel list"

As the problem is absent in sane 32-bit, and permanent in 64-bit, it 
could well be a development issue.
in the tracker it reads:


  [#314019] my scanner has a problem in the 64-bit systems but works
  fine with the same systems in 32 bit

Scanning several pages with my flatbed scanner works fine for the first 
two pages; the subsequent pages will have wide coloured vertical bands 
in the background (black for a grayscale scan).
This is true for the 64-bit versions of Fedora 16, 17 and 18; with the 
32-bit versions of the mentioned distributions there is no problem.
Scanning using xsane or simple-scan produce both the misbehaviour.
After leaving the graphical fronted and it's restart one can again scan 
two pages properly.

Version details are (here with Fedora 17):
Linux 3.7.3-101.fc17.x86_64
sane-frontends-1.0.14-14.fc17.src.rpm
sane-backends-1.0.23-4.fc17.src.rpm
idem libs and drivers-scanners

scanimage -L
device `plustek:libusb:003:003' is a Epson Perfection 1250/Photo flatbed 
scanner

joined the scan of an empty, white but not very clean, A4 sheet, scanned 
as n° 3 after startup of xsane.

The workaround is to stay in a 32-bit OS

submitted also at bugzilla.redhat.com for fedora with the id 909551

comparing the joined file with the one joined with 304296 (08/04/2007 - 
not solved yet) and the problem description there with this one, the 
similarity is striking:
the coloured bands are similar
OK with the 32 bit OS Gentoo, problem with the same OS in 64 bit

but
the scanners are of different models (but may use the same chip)
the OS's are different distributions

Gerard van der Veen



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