[Bug 1731459] Re: genesys_gl847 scanners produce a black band in scanned images on Ubuntu 17.10+, 18.04 LTS and 18.10 Cosmic cuttlefish

[Simon Repp]

@Ananth, @Gunnar: I wanted to cross-verify that the patch works for LiDE
200 on bionic 18.04.3 - To do this I booted from a fresh bionic live usb
stick and installed the patch from ppa in the live session. However what
I discovered is that this does not work on bionic AND also does not work
on a disco live session (which I tried then too to make sure it is not a
live session related issue).

Maybe you were already aware that testing it this way wouldn't work at
all, but just for the record in case you weren't and so that everyone
else knows that verifying this on a live session is (apparently) not
possible.

I got these packages installed from ppa in the two live sessions just for reference/checking:
sane-utils/bionic,now 1.0.27-1~experimental3ubuntu2.2~ppa amd64 [installed, automatic]
sane-utils/disco,now 1.0.27-3.2ubuntu1.1~ppa amd64 [installed, automatic]

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https://bugs.launchpad.net/bugs/1731459

Title:
  genesys_gl847 scanners produce a black band in scanned images on
  Ubuntu 17.10+,  18.04 LTS and 18.10 Cosmic cuttlefish

Status in sane-backends:
  Unknown
Status in sane-backends package in Ubuntu:
  In Progress
Status in sane-backends source package in Bionic:
  In Progress
Status in sane-backends source package in Disco:
  In Progress
Status in sane-backends package in Debian:
  Unknown

Bug description:
  [Impact]

  When using a Genesys GL847 scanner, the documents get disfigured by a
  discolored bar. The proposed uploads should fix the issue. They are
  available in this PPA:

  https://launchpad.net/~gunnarhj/+archive/ubuntu/sane-backends

  [Test case]

  1. Install the libsane (libsane1 in bionic), libsane-common
     and sane-utils packages from {bionic,disco]-proposed.

  2. Use an affected device to scan, and find that the issue is
     no longer present.

  [Regression risk]

  Upstream commit, focused bug fix => low regression risk

  [Original description]

  On Windows it works but on my Ubuntu 17.10, 18.04 and 18.10 I see a
  black band on scanned image. The scanner is Canon CanoScan LIDE100.
  Libsane version is 1.0.27-1~experimental2ubuntu1

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