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
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