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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

This issue cannot be reproduced on a laptop with touchscreen, so I think it's the issue of this touchscreen
ubuntu@201305-13670:~$ xinput list
⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳ USB Optical Mouse                       	id=11	[slave  pointer  (2)]
⎜   ↳ Advanced Silicon S.A CoolTouch(TM) System	id=13	[slave  pointer  (2)]
⎜   ↳ Microsoft Bluetooth Notebook Mouse 5000 	id=15	[slave  pointer  (2)]
⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
    ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
    ↳ Power Button                            	id=6	[slave  keyboard (3)]
    ↳ Video Bus                               	id=7	[slave  keyboard (3)]
    ↳ Video Bus                               	id=8	[slave  keyboard (3)]
    ↳ Power Button                            	id=9	[slave  keyboard (3)]
    ↳ Integrated_Webcam_FHD                   	id=10	[slave  keyboard (3)]
    ↳ LITE-ON Technology USB NetVista Full Width Keyboard.	id=12	[slave  keyboard (3)]
    ↳ Dell AIO WMI hotkeys                    	id=14	[slave  keyboard (3)]

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https://bugs.launchpad.net/bugs/1384535

Title:
  [Dell Inspiron 2350] Touchscreen response shifted with external
  monitor connected

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  CID: 201305-13670 Dell Inspiron 2350

  When connected to a non-touch external monitor, the touchscreen on this system seems to be "shifted".
  The cursor no longer jump to where you touch the screen, but it landed on the right side instead, see the attached picture for a click-and-drag result.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.57 [modified: boot/vmlinuz-3.13.0-32-generic]
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     1705 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     1705 F.... pulseaudio
  CRDA:
   country TW:
   	(2402 - 2472 @ 40), (3, 27)
   	(5270 - 5330 @ 40), (3, 17), DFS
   	(5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Wed Oct 22 22:59:20 2014
  HibernationDevice: RESUME=UUID=6ce5638a-313b-43d2-8def-91a019f94f3d
  InstallationDate: Installed on 2014-10-22 (1 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Inspiron 2350
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic.efi.signed root=UUID=2fbfe78e-1f35-4822-bf6f-24f529a853f7 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/02/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A02
  dmi.board.name: 0P4T42
  dmi.board.vendor: Dell Inc.
  dmi.board.version: X02
  dmi.chassis.type: 13
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 00
  dmi.modalias: dmi:bvnDellInc.:bvrA02:bd09/02/2013:svnDellInc.:pnInspiron2350:pvr00:rvnDellInc.:rn0P4T42:rvrX02:cvnDellInc.:ct13:cvr00:
  dmi.product.name: Inspiron 2350
  dmi.product.version: 00
  dmi.sys.vendor: Dell Inc.

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