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["uhon.ch" <uhon@xxxxxxx>]

Same problem here. Attached external Monitors (different monitors and resolutions tested) through VGA or DP on my Notebook i experience problems with the mentioned screen placement.
The above screen works perfectly as long as the cursor stays on that screen. Wen I move the cursor down to the built-in screen, the above monitor starts to scroll between the screens.
I'm unable to move a window down to the built-in screen. Window-Title-Bar seems to hang at the bottom of the screen, also the rest of the window is shown on the other screen.

this short video demonstrates the problem:
https://www.youtube.com/watch?v=7Qlkpe2MpNk

I once experienced this scrolling effect also horizontally (monitor to
the right), but this happened only for a single screen session.

Editing ~/.config/monitors.xml manually resulted in the same problem, also when screens were placed using xrandr.
I also changed primary monitor (in monitors.xml) to the external one, but that had also no effect.

Sidenote (may or may not be important): I'm using nvidia-prima, which enables me to switch between graphics cars.
My System is a Lenovo Thinkpad T430 with two graphic cards a.k.a. nvidia optimus (DP wired to Nvidia 5400M and VGA wired to and Onboard Intel-Graphics Chip), problem happens on both ports.

** Changed in: unity (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1312342

Title:
  dual monitor breaks when not config'd for builtin monitor is to the
  left of second monitor

Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  Upgraded from 13.10 to 14.04 on my dual monitor system.  System
  consists of a system76 laptop (built in monitor is 1920x1080
  resolution) and an external monitor (ASUS 1920x1080 resolution).

  Prior to the upgrade, the monitors were configured with the ASUS
  monitor above the laptop monitor.  After the upgrade, the monitor
  configuration reverted to be configured with the laptop on the left
  (ASUS on the right).  When I use the Settings->Display tool to move
  the monitors to the previous configuration, it is no longer possible
  to move windows between the monitors or to move the cursor between the
  monitors.  This did work fine previously, so is a regression.  I have
  tried several other configurations, and none seem to work other than
  the default.

  One other note, I use synergy to provide keyboard and mouse from my
  desktop system (i.e., the laptop is the client).  This works fine, but
  since it does affect the mouse thought worth mentioning in case there
  was some interaction from that involved.

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