Public bug reported:

Using newest Quantal the mouse cursor started behaving strangely. When I
move the mouse, the cursor jumps back and forth between two locations,
which can up to a centimeter apart. Both cursor locations move according
to mouse motion.

If I push the cursors to the top left corner, they overlap. However in
use they start to slowly drift apart again.

This is not a rendering bug. The cursor actually moves. This can be
verified like this:

Suppose the two mouse locations are A and B and there are application
two buttons called 1 and 2. These buttons are separate, they have some
space (or another widget) between them. Then one moves the cursor so
location A is over button 1 and location B is over button 2. Moving the
mouse even a tiny distance makes the cursor jump between these two
locations randomly. When location A is active, pressing the mouse button
activates button 1. Correspondingly location B activates button 2.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: xserver-xorg 1:7.7+1ubuntu4
ProcVersionSignature: Ubuntu 3.5.0-17.27-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  304.43  Sun Aug 19 20:14:03 
PDT 2012
 GCC version:  gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1)
.tmp.unity.support.test.0:
 
ApportVersion: 2.6.1-0ubuntu2
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
Date: Wed Oct 10 14:32:45 2012
DistUpgraded: Fresh install
DistroCodename: quantal
DistroVariant: ubuntu
DkmsStatus:
 nvidia-current, 304.43, 3.5.0-14-generic, x86_64: installed
 nvidia-current, 304.43, 3.5.0-17-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation C68 [GeForce 7050 PV / nForce 630a] [10de:053b] (rev a2) 
(prog-if 00 [VGA controller])
   Subsystem: NVIDIA Corporation Device [10de:cb84]
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120918.1)
MachineType: Shuttle Inc SN68PT
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.5.0-17-generic 
root=UUID=13f61e3f-9582-47a8-988c-a29fed44d3af ro rootflags=subvol=@ quiet 
splash
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/13/2007
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: 6.00 PG
dmi.board.name: FN68PT
dmi.board.vendor: nVIDIA
dmi.board.version: V10
dmi.chassis.asset.tag: Unknow
dmi.chassis.type: 3
dmi.chassis.vendor: Shuttle Inc
dmi.chassis.version: G2
dmi.modalias: 
dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd08/13/2007:svnShuttleInc:pnSN68PT:pvrV10:rvnnVIDIA:rnFN68PT:rvrV10:cvnShuttleInc:ct3:cvrG2:
dmi.product.name: SN68PT
dmi.product.version: V10
dmi.sys.vendor: Shuttle Inc
version.compiz: compiz 1:0.9.8.4-0ubuntu2
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.39-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0-0ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.99.99~git20120913.8637f772-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.9-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.2-0ubuntu3

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


** Tags: amd64 apport-bug compiz-0.9 quantal running-unity ubuntu

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1064979

Title:
  Mouse cursor teleports between two different locations

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https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1064979/+subscriptions

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