Public bug reported:

In my desktop system Kubuntu 15.10 I have the integrated graphic card
(Intel HD3000) and a discrete graphic card (Nvidia GTX 550). Some days
ago I attached a monitor on the iGPU and enabled it, giving me a triple
head system (two monitors on the Nvidia and one on the Intel). From that
moment, the mouse pointer started to leave a trail when it pass over
something that is animating. I'm using nouveau for the nvidia card. I
tried to upgrade to Kubuntu 16.04, but it gives me the same glitch. It's
not possible to take a screenshot because it will repaint the desktop
prior to take it, so the glitch doesn't appear: I had to take a photo.

1) $ lsb_release -rd
Description:    Ubuntu Xenial Xerus (development branch)
Release:        16.04

2) $ apt-cache policy xorg
xorg:
  Installato: 1:7.7+13ubuntu1
  Candidato:  1:7.7+13ubuntu1
  Tabella versione:
 *** 1:7.7+13ubuntu1 500
        500 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

3) I expect normal mouse behaviour

4) Mouse leaves a trail of pointers

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xserver-xorg-core 2:1.17.3-2ubuntu4
ProcVersionSignature: Ubuntu 4.4.0-8.23-generic 4.4.2
Uname: Linux 4.4.0-8-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
Date: Sun Feb 28 22:50:01 2016
ExecutablePath: /usr/lib/xorg/Xorg
InstallationDate: Installed on 2015-11-19 (100 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: xorg-server
UpgradeStatus: Upgraded to xenial on 2016-02-24 (4 days ago)

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

** Attachment added: "photo of an area of the screen filled with mouse pointers"
   
https://bugs.launchpad.net/bugs/1551022/+attachment/4583924/+files/DSC_0480.JPG

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Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1551022

Title:
  mouse pointer leaves trail

Status in xorg-server package in Ubuntu:
  New

Bug description:
  In my desktop system Kubuntu 15.10 I have the integrated graphic card
  (Intel HD3000) and a discrete graphic card (Nvidia GTX 550). Some days
  ago I attached a monitor on the iGPU and enabled it, giving me a
  triple head system (two monitors on the Nvidia and one on the Intel).
  From that moment, the mouse pointer started to leave a trail when it
  pass over something that is animating. I'm using nouveau for the
  nvidia card. I tried to upgrade to Kubuntu 16.04, but it gives me the
  same glitch. It's not possible to take a screenshot because it will
  repaint the desktop prior to take it, so the glitch doesn't appear: I
  had to take a photo.

  1) $ lsb_release -rd
  Description:    Ubuntu Xenial Xerus (development branch)
  Release:        16.04

  2) $ apt-cache policy xorg
  xorg:
    Installato: 1:7.7+13ubuntu1
    Candidato:  1:7.7+13ubuntu1
    Tabella versione:
   *** 1:7.7+13ubuntu1 500
          500 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  3) I expect normal mouse behaviour

  4) Mouse leaves a trail of pointers

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xserver-xorg-core 2:1.17.3-2ubuntu4
  ProcVersionSignature: Ubuntu 4.4.0-8.23-generic 4.4.2
  Uname: Linux 4.4.0-8-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  Date: Sun Feb 28 22:50:01 2016
  ExecutablePath: /usr/lib/xorg/Xorg
  InstallationDate: Installed on 2015-11-19 (100 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  SourcePackage: xorg-server
  UpgradeStatus: Upgraded to xenial on 2016-02-24 (4 days ago)

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