Public bug reported:

= Affected Packages =

xserver-xorg-core-lts-quantal 2:1.13.0-0ubuntu6.1~precise2 in precise
xserver-xorg-core-lts-quantal 2:1.13.0-0ubuntu6.1~precise3 in precise

= Reproduce Steps =

1. Boot into Ubuntu 12.04.2 live system

2. Expand the laptop display to the external one.
For example, `xrandr --output eDP1 --auto --output HDMI1 --auto --right-of eDP1`

3. Restrict the movements of the touchscreen to the laptop display.
For example, `xinput map-to-crtc 'ELAN Touchscreen' eDP1`

P.S. `xinput map-to-crtc` will calculate and set "Coordinate
Transformation Matrix" correspondingly.

= Expected Result =

I can operate the touchscreen on the laptop display as usual.

= Actual Result =

It becomes abnormal and shows erratic cursor movement.

** Affects: xorg-server-lts-quantal (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

- = Package Version =
+ = Affected Packages =
  
+ xserver-xorg-core-lts-quantal 2:1.13.0-0ubuntu6.1~precise2
  xserver-xorg-core-lts-quantal 2:1.13.0-0ubuntu6.1~precise3
  
  = Reproduce Steps =
  
  1. Boot into Ubuntu 12.04.2 live system
  
  2. Expand the laptop display to the external one.
  For example, `xrandr --output eDP1 --auto --output HDMI1 --auto --right-of 
eDP1`
  
  3. Restrict the movements of the touchscreen to the laptop display.
  For example, `xinput map-to-crtc 'ELAN Touchscreen' eDP1`
  
  P.S. `xinput map-to-crtc` will calculate and set "Coordinate
  Transformation Matrix" correspondingly.
  
  = Expected Result =
  
  I can operate the touchscreen on the laptop display as usual.
  
  = Actual Result =
  
  It becomes abnormal and shows erratic cursor movement.

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https://bugs.launchpad.net/bugs/1212123

Title:
  Erratic cursor movement when using "Coordinate Transformation Matrix"

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