wrong color of horizontally centered area of scan with CanoScan Lide 200

[Helmut Tischer]

This problem is 100% reproducable, also across reboots.

On a Ubuntu 16.04 and 17.04 and Windows7 system the Scanner CanoScan Lide 200 works still completely fine.

Problem with Ubuntu 17.10 :
In a horizontally centered zone of about 1 centimeter width of the scan surface, over the full height of the surface, estimated 90% of the pixel values are completely wrong.
The distribution of the wrong pixels in this zone appears random.
With lineart and gray scan, the wrong pixels are black. With color scan, the wrong pixels are black or similar to red. The other pixels in the zone are a bit too bright. The effect is the same at all resolutions. See attached example snippets. The effect would continue vertically over the entire scan surface. The original was uniformly colored.

The scanner worked again with Ubuntu 17.10 after purging sane-utils,libsane1,libsane-common (by overriding dependency-errors) and installing libsane-common_1.0.25+git20150528-1ubuntu4_all.deb libsane_1.0.25+git20150528-1ubuntu4_amd64.deb sane-utils_1.0.25+git20150528-1ubuntu4_amd64.deb (again by overriding dependency-errors) (and maybe re-plug scanner / reboot)

Trying these versions had the same problem as default Ubuntu 17.10:
archive.ubuntu.com : 1.0.27-1~experimental2ubuntu2.1, launchpad.net/~rolfbensch/+archive/ubuntu/sane-git : 1.0.27+git20171012-artful0

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: libsane1 1.0.27-1~experimental2ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Tue Oct 31 20:48:39 2017
InstallationDate: Installed on 2015-12-31 (670 days ago)
InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: sane-backends
UpgradeStatus: No upgrade log present (probably fresh install)

[SchnippenSchnappen (snibbedisnaps)]

I have a CanoScan LiDE 100 but otherwise the exact same setup. I can fully confirm that this bug is caused by the new ibsane1 1.0.27-1~experimental packages and "fixed" by force replacing all sane packages with the 1.0.25 packages from Ubuntu 17.04.

Somebody also posted this on askubuntu: https://askubuntu.com/questions/973526/thick-black-vertical-line-with-canon-lide-100-scanner-in-ubuntu-17-10

So there are multiple users affected indeed.

What I wasn't able to confirm yet is if the current stable release of sane-backends 1.0.27 might fix this or not. You can get it here: https://launchpad.net/~rolfbensch/+archive/ubuntu/sane-release?field.series_filter=

I also found an interesting correlation with this bug: https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1712997
This seems to happen also on the old drivers for this user but the visual artifacts are very similar.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[SchnippenSchnappen (snibbedisnaps)]

I did some testing with different colours. Maybe this helps to pinpoint what's actually going wrong.

[Dennis (dm.bayern)]

Very interesting fact:
I have two Canoscan LiDe 200 devices. One is showing the vertical bar on my Ubuntu 16.04/ libsane(1.0.27+git20180103-xenial0) the other one not.
Does anyone know if there are several slighly different models (with different chips?) out there in the market?

[SchnippenSchnappen (snibbedisnaps)]

Nope, there is only one model with one chip one the market. The chip is also identical to the CanoScan LiDE 100. (See Screenshot attached.)

Please note that this bug is a duplicate of this bug #1731459 (https://bugs.launchpad.net/bugs/1731459) since all GL847 chip bases scanners are affected by this bug. It would be great if you could repost your findings in the main bug report since it is VERY interesting that you have different results with two devices of the same model and also with the more recent git-version of 1.0.27.

[teras (panayotis)]

I have the same problem.
I found this post after I posted to ask ubuntu, where I also uploaded some screenshots which demonstrate the problem.

Maybe it is interesting to keep them as reference :)

https://askubuntu.com/questions/996666/canon-canoscan-lide-200-scans-with-a-black-bar

[Metal Matze (metalmatzeger)]

I have the same problem with the Canon LiDe 100