Comment 0 for bug 1287341

My laptop has a touchscreen. It works fine in 14.04 until I plug in an external monitor. When using an external monitor, input from the touchscreen is remapped so that the touchscreen provides input to both monitors. The result is that there is no longer a 1:1 correspondence between moving your finger and the cursor. This is confusing and difficult to use.

A touchscreen is a direct input device (vs an indirect one like a mouse/touchpad); input from the touchscreen should be bound to the physical display that it's attached to.

To reproduce:
1) On a computer with a touchscreen, use the touchscreen to move a window around, including to the edges of the screen. Note that the window moves exactly with your finger.
2) Plug in an external monitor
3) Try the same actions as in step 1

Expected results:
The touchscreen continues to operate as in step 1, allowing you to manipulate items on the display that contains the touchscreen. The touchscreen does not interact with windows, etc on the external monitor

Actual results:
The touchscreen is remapped across both displays. The result is that touch events no longer happen 'under the finger'. Assuming the two displays are the same size and resolution, moving your finger 1cm will cause the window or other objects to move 2cm onscreen. It becomes impossible to use the touchscreen to interact with widgets (menus, buttons, etc).

This is described in couple places:
http://askubuntu.com/questions/51445/how-do-i-calibrate-a-touchscreen-on-a-dual-monitor-system
http://askubuntu.com/questions/71768/touchscreen-and-additional-external-monitor

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xinput 1.6.1-1
ProcVersionSignature: Ubuntu 3.13.0-14.34-generic 3.13.5
Uname: Linux 3.13.0-14-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.13.2-0ubuntu5
Architecture: amd64
CompizPlugins: [core,commands,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: Mon Mar 3 14:41:14 2014
DistUpgraded: 2014-02-12 13:40:42,704 DEBUG enabling apt cron job
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-precise-amd64-20130203-1
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 oem-audio-hda-daily-lts-quantal, 0.201308192259~precise1, 3.5.0-45-generic, x86_64: installed
 virtualbox, 4.3.6, 3.13.0-12-generic, x86_64: installed
 virtualbox, 4.3.6, 3.13.0-14-generic, x86_64: installed
 virtualbox, 4.3.6, 3.13.0-8-generic, x86_64: installed
EcryptfsInUse: Yes
GraphicsCard:
 Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:060a]
InstallationDate: Installed on 2013-12-02 (90 days ago)
InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130203-13:50
MachineType: Dell Inc. XPS13 9333
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-14-generic root=UUID=0b9db31c-747b-40ad-bbbd-13a9a29caece ro quiet splash vt.handoff=7
SourcePackage: xinput
UpgradeStatus: Upgraded to trusty on 2014-02-12 (19 days ago)
dmi.bios.date: 11/11/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A01
dmi.board.name: 0GFTRT
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnDellInc.:bvrA01:bd11/11/2013:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0GFTRT:rvrA00:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: XPS13 9333
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.11+14.04.20140218-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0~rc1-1ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0~rc1-1ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Mon Mar 3 11:02:50 2014
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 4933
 vendor CMN
xserver.version: 2:1.15.0-1ubuntu6