Touch device ignores external monitor in Lenovo thinkpad X230 tablet

[Rüdiger Kupper]

WHAT HAPPENS:
When I connect an external monitor to the VGA port of the Lenovo X230 tablet, and locate the second (external) screen to be left of the internal screen, all mouse events generated by the touch device appear displaced to the left. The mouse cursor is always left of my finger by the width of the external screen.

WHAT I EXPECT:
The mouse cursor is always below my finger, regardless of any external monitor connected and where the second screen is located.

DIAGNOSIS:
Obviously, the touch device reports mouse events relative to the upper left of the internal screen, ignoring the external screen on the left.
The second absolute input device of the X230 tablet (stylus) is NOT AFFECTED by this bug. The mouse cursor is always below the tip of the stylus, regardless of external screen.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: xinput 1.6.1-1
ProcVersionSignature: Ubuntu 3.16.0-33.44-generic 3.16.7-ckt7
Uname: Linux 3.16.0-33-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.7-0ubuntu8.2
Architecture: amd64
BootLog:
 * Setting up X socket directories... 
[ OK ]
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
Date: Wed Apr 1 19:21:42 2015
DistUpgraded: 2014-10-24 11:41:44,416 DEBUG failed to SystemUnLock() (E:Nicht gesperrt)
DistroCodename: utopic
DistroVariant: ubuntu
DkmsStatus: virtualbox, 4.3.18, 3.16.0-33-generic, x86_64: installed
EcryptfsInUse: Yes
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:2203]
InstallationDate: Installed on 2013-04-12 (719 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: LENOVO 34382AG
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-33-generic root=/dev/mapper/vg-lv--root ro quiet splash vt.handoff=7
SourcePackage: xinput
UpgradeStatus: Upgraded to utopic on 2014-10-24 (159 days ago)
dmi.bios.date: 02/25/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: GCET92WW (2.52 )
dmi.board.asset.tag: Not Available
dmi.board.name: 34382AG
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrGCET92WW(2.52):bd02/25/2013:svnLENOVO:pn34382AG:pvrThinkPadX230Tablet:rvnLENOVO:rn34382AG:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 34382AG
dmi.product.version: ThinkPad X230 Tablet
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.56-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.2-0ubuntu0.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.2-0ubuntu0.1
version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1.3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
xserver.bootTime: Wed Apr 1 19:20:49 2015
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 44304
 vendor ACR
xserver.version: 2:1.16.0-1ubuntu1.3