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[Brett Sutton <1326688@xxxxxxxxxxxxxxxxxx>]

A quick work around that I've found.

2nd monitor attached to a laptop.

Enable second monitor as primary.

Second monitor appears to the left of the laptop monitor.

Panning problem occurs.

Go into the gnome 'Arrange Combined Displays'.

Reverse the order  of the monitors (2nd now arranged to right of laptop monitor).
Apply and Confirm settings.

Go back into 'Arrange Combined Displays'.

Reverse the order of the monitors again so the external display is once again to the left of the internal display.
Apply and Confirm settings.

Panning problem is now fixed.

Not a solution but....

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https://bugs.launchpad.net/bugs/1326688

Title:
  Can't disable panning on multiple monitors

Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  System:

  Dell laptop E6520 with two graphic cards:

  00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
  01:00.0 VGA compatible controller: NVIDIA Corporation GF119M [NVS 4200M] (rev a1) (prog-if 00 [VGA controller])

  I have 3 monitors connected through docking stations, DP-0 and DP-1
  connected to Nvidia card and VGA-1-0 connected to Intel card.

  I'm usind nvida-331 driver and nvidia-prime:

  nbr@nbr-nb:~$ dpkg --get-selections | grep nvidia
  nvidia-331					install
  nvidia-common					install
  nvidia-libopencl1-331				install
  nvidia-opencl-icd-331				install
  nvidia-prime					install
  nvidia-settings					install

  I can setup correctly this triple-head config with Monitor Settings in
  Ubuntu Control Panel, but this enable panning as per xrandr output:

  nbr@nbr-nb:~$ xrandr -q | grep conn
  VGA-0 disconnected (normal left inverted right x axis y axis)
  LVDS-0 disconnected (normal left inverted right x axis y axis)
  DP-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm panning 2560x1024+0+0 tracking 4240x1050+0+0 border 0/0/0/0
  DP-1 connected primary 1680x1050+1280+0 (normal left inverted right x axis y axis) 433mm x 270mm panning 2960x1050+1280+0 tracking 4240x1050+0+0 border 0/0/0/0
  HDMI-0 disconnected (normal left inverted right x axis y axis)
  DP-2 disconnected (normal left inverted right x axis y axis)
  DP-3 disconnected (normal left inverted right x axis y axis)
  LVDS-1-0 connected
  VGA-1-0 connected 1280x1024+2960+0 376mm x 301mm

  and it seems there is no way to disable it (even issuing xrandr with
  --panning 0x0+0+0 option to DP-0 and DP-1 has no effect).

  This was working correctly after a undock/dock of the laptop, maybe an
  update broke config since it has always showed problems with
  undock/dock, but a reboot always cured the situation. Now it can't be
  setup like initial config anymore (three indipendent monitors with no
  panning and windows moving around all monitors).

  
  other sysinfo:

  nbr@nbr-nb:~$ lsb_release -rd
  Description:	Ubuntu 14.04 LTS
  Release:	14.04
  nbr@nbr-nb:~$ apt-cache policy nvidia-331
  nvidia-331:
    Installato: 331.38-0ubuntu7
  nbr@nbr-nb:~$ apt-cache policy nvidia-prime
  nvidia-prime:
    Installato: 0.6.2
  nbr@nbr-nb:~$ apt-cache policy xserver-xorg
  xserver-xorg:
    Installato: 1:7.7+1ubuntu8

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