Public bug reported:

Occasionally, my cursor stops following my mouse movements.

I followed instructions described here:

https://wiki.ubuntu.com/DebuggingTouchpadDetection

If you do not find a Touchpad in you /proc/bus/input/devices, the bug is in the 
kernel itself and you should follow these steps:
Provide the general information.

Directly after logging in to GNOME, KDE, or Xfce open a terminal and
enter the following commands:

cat /proc/bus/input/devices > ~/devices
dmesg > ~/dmesg_boot
cp /var/log/Xorg.0.log ~/Xorg.0.log 
Wait until your touchpad stops working.
Open a Virtual Terminal by pressing Ctrl-Alt-F1.
Enter the following commands:

LANG=C
dmesg > ~/dmesg
diff -ns ~/dmesg_boot ~/dmesg > ~/dmesg_diff
cp /var/log/Xorg.0.log ~/Xorg.0.log_tmp
diff -ns ~/Xorg.0.log ~/Xorg.0.log_tmp > ~/Xorg.0.log_diff 
Attach as separate attachments to your bug report ~/devices, ~/dmesg_boot, 
~/dmesg_diff, ~/Xorg.0.log and ~/Xorg.0.log_diff.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10
Uname: Linux 4.4.0-24-generic x86_64
NonfreeKernelModules: wl
.tmp.unity_support_test.0:
 
.tmp.unity_support_test.1:
 
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Sat Jun 25 17:57:40 2016
DistUpgraded: 2016-05-30 11:23:22,422 ERROR failed to import apport python 
module, can't generate crash: No module named 'xml.dom'
DistroCodename: xenial
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) 
(prog-if 00 [VGA controller])
   Subsystem: Dell Broadwell-U Integrated Graphics [1028:0665]
InstallationDate: Installed on 2015-05-18 (404 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
LightdmLog:
 [+7057.65s] DEBUG: Seat seat0 changes active session to 
 [+7063.85s] DEBUG: Seat seat0 changes active session to 40
 [+7145.78s] DEBUG: Seat seat0 changes active session to c7
 [+7145.78s] DEBUG: Session c7 is already active
MachineType: Dell Inc. XPS 13 9343
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-24-generic 
root=/dev/mapper/ubuntu--vg-root ro persistent quiet splash vt.handoff=7 
init=/sbin/upstart
SourcePackage: xorg
UpgradeStatus: Upgraded to xenial on 2016-05-30 (26 days ago)
dmi.bios.date: 11/11/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 0310JH
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA07:bd11/11/2015:svnDellInc.:pnXPS139343:pvr:rvnDellInc.:rn0310JH:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: XPS 13 9343
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2

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


** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial

** Attachment added: "Xorg.0 updates up until problem"
   
https://bugs.launchpad.net/bugs/1596248/+attachment/4690340/+files/Xorg.0.log_diff

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https://bugs.launchpad.net/bugs/1596248

Title:
  Touchpad stops working occasionally

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