Regression on Canon LiDE 120 by fix for #1731459

[nmaxx]

THIS IS INCORRECT! I mis-remembered it working on 18.04 earlier.

SANE 1.0.29 properly fixes #1731459 for a LiDE 120 scanner.
------------------------------------------------------ original report

sane-backends (1.0.27-1~experimental3ubuntu2.2) brought a fix for a black vertical band on scans
done with e.g. Canon LiDE 100 and 200 scanners on Ubuntu 18.04 as noted here:

   sane-backends (1.0.27-1~experimental3ubuntu2.2) bionic; urgency=medium

     * debian/patches/git-fix-discolored-bar-issue.patch:
       - Upstream commit to fix issue with discolored bar on Genesys GL847
         scanners (LP: #1731459).

    -- Gunnar Hjalmarsson <email address hidden> Thu, 08 Aug 2019 20:27:00 +0200

However, on my Canon LiDE 120 it worked fine before that fix in 18.04, but now the image shows
a discolored band at precisely the same location where on an LiDE 100/200 the black band
used to be.

See attached test scan for an example and compare with the uploads from
https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1731459 .

Affected are also daily builds of 20.04 from 2020-02-15.

[nmaxx (nmaxx)]

I tried with an old 18.04.1 ISO and the same issue appeared, so it was likely no regression after all just a fix that did not work 100% . I must have misremembered it working properly...

[Gunnar Hjalmarsson (gunnarhj)]

Did you see bug #1862926?

[nmaxx (nmaxx)]

Not yet, thanks for the hint.