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[Mauro Sassi <1728364@xxxxxxxxxxxxxxxxxx>]

I further tested this on a live session of Ubuntu Gnome 17.04 and Fedora
26 (Gnome 3.24) and the bug was not present there. I will test it on
Fedora 27 as soon as it is released to check if the issue is related to
Gnome 3.26 or Ubuntu specific.

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https://bugs.launchpad.net/bugs/1728364

Title:
  gnome-color-manager wrong calibration due to transparent patches

Status in gnome-color-manager package in Ubuntu:
  New

Bug description:
  When performing display color calibration through gnome-color-manager
  using hardware colorimeter (pantone huey in my case) odd profile
  results are obtained and sometimes the process fails. The problem is
  probably due to the test on-screen color patches that are rendered in
  a full screen window but have a trasparent layer applied to them
  instead of being opaque as expected (see atteched screenshot). This
  does not appear to be an argyll problem as the calibration with the
  same setup can be performed sussessfully installing and using
  DisplayCAL app that also uses argyll. The bug is also present in the X
  session.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: gnome-color-manager 3.26.0-1
  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: GNOME
  Date: Sun Oct 29 10:52:26 2017
  InstallationDate: Installed on 2017-10-26 (2 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=it_IT.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-color-manager
  UpgradeStatus: No upgrade log present (probably fresh install)

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