I have this problem on Linux Mint 17.1 (Ubuntu 14.04 base) too on a
Lenovo T420s with Optimus graphics using the Nvidia card as primary.

It seems to work as expected if I put the screens in order [LVDS-1-0] --
[VGA-1-0] -- [DP-3] from left to right, but if I put DP-3 in the middle,
I can't disable panning for it.

Just putting the screens in this physical order works for me, but I run
into another problem when I try to set the middle screen (VGA-1-0) to
primary in order to get my KDE taskbar on the middle screen. Trying to
set any of the screens provided by modesetting to primary fails with the
following error:

  $ xrandr --output VGA-1-0 --primary
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  30 (RRSetOutputPrimary)
  Serial number of failed request:  50
  Current serial number in output stream:  52

  $ xrandr --output LVDS-1-0 --primary
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  30 (RRSetOutputPrimary)
  Serial number of failed request:  50
  Current serial number in output stream:  52

I attach my Xorg configuration (generated by nvidia-settings), the Xorg
log file, a dump of 'xrandr --verbose' output and 'xrandr
--listproviders' output.

** Attachment added: "nvidia_multiscreen_problem.tar.gz"
   
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1326688/+attachment/4762455/+files/nvidia_multiscreen_problem.tar.gz

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

Title:
  Can't disable panning on multiple monitors

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