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  My mouse inputs aren't being handled properly by a few but not all applications in Ubuntu 16.04 using the Mate desktop.  The problem occurs on my system that has 3 gpus, 5 monitor setup with compiz, accelerated graphics, and xinerama enabled.  I'm using the Nvidia 361 drivers.  I do not have these problems on my laptop, a single monitor setup with compiz and accelerated graphics enabled.

  Applications like the Caja file manager handles all the mouse inputs
correctly, but the Dolphin file manager doesn't.  In Dolphin, I can
mouse click the menu items just fine, but any sub-menu mouse inputs are
not registered.  Also in Dolphin, none of the mouse inputs are
recognized while clicking on any of the files/folders/places but I can
still use the mouse to scroll the file list window.

  Other applications that exhibit this odd mouse behavior are VLC and
SMPlayer (see https://bugs.launchpad.net/ubuntu-mate/+bug/1637020 for a
bug with VLC that I filed that I believe has a similar root cause).
Other applications that I've used that don't exhibit this behavior are
firefox, chromium, virtual box kaffeine, tvtime...  actually, all the
other programs I've tried don't have this problem.  I'll update the list
of problem applications as I come across them.  My *guess* is that the
common denominator between these problem applications is that they use
the same graphical tool kit and that there is a flaw in that tool kit's
implementation that affects multi-gpu systems.

  If you want, I can record my desktop to demonstrate the problem.

** Affects: ubuntu-mate
     Importance: Undecided
         Status: Invalid

** Affects: dolphin (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: qtbase-opensource-src (Ubuntu)
     Importance: Undecided
         Status: New

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Ubuntu Mate 16.04 mouse inputs not handled correctly on multi gpu system
https://bugs.launchpad.net/bugs/1637034
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