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[Giampiero Salvi <1295267@xxxxxxxxxxxxxxxxxx>]

Confirming this bug on Ubuntu 16.04. Also using dual monitor, with one
monitor in vertical orientation. The bug did not affect me before I
upgraded from 14.04 to 16.04, but around the same time I also changed
one of the monitors, so I cannot tell which is the cause (reading the
previous messages I suspect the cause was the change in monitor rather
than the upgrade).

The vertical monitor hasn't changed and is a dell 22" with resolution
1680x1050.

Before the change, the horizontal monitor was a Samsung SyncMaster 2443 with resolution 1920x1200. 
After the change, the horizontal monitor is a Philips BDM3270 with resolution 2560x1440. 

The graphic card is:
Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06)

Kernel: 4.4.0-47-generic
XRandr reports:
Screen 0: minimum 8 x 8, current 3610 x 1680, maximum 32767 x 32767
DP1 connected 1050x1680+2560+0 left (normal left inverted right x axis y axis) 474mm x 296mm
   1680x1050     59.88*+
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.08    60.00  
   800x600       75.00    60.32  
   640x480       75.00    60.00  
   720x400       70.08  
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 708mm x 398mm
   2560x1440     59.95*+
   1920x1080     60.00    50.00    50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1440x900      74.98    59.90  
   1280x960      60.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.08    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x576i      50.00  
   720x480       60.00    59.94  
   720x480i      60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08  
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

Not sure if you need more info.

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https://bugs.launchpad.net/bugs/1295267

Title:
  Windows change Monitor/Desktop after screen lock

Status in Unity:
  Fix Released
Status in Unity 7.1 series:
  Fix Released
Status in compiz-plugins-main package in Ubuntu:
  Fix Released
Status in unity package in Ubuntu:
  Triaged

Bug description:
  I run a dual monitor configuration, with one portrait and one
  landscape.

  I nearly always have multiple applications open in multiple windows
  across both monitors and all virtual desktops.

  When I lock the screen and then unlock, my application windows will
  move from their original position.

  Sometimes they are in completely random positions;

  Other times they seem to get the monitors confused, and rather than
  being in the top half of the portrait monitor they are on the top half
  of the landscape monitor;

  Sometimes it is only a new desktop, but the monitor position is the
  same;

  Sometimes it is the same desktop, but on the other monitor.

  Description:	Ubuntu 13.10
  Release:	13.10

  What I expect to happen: When I unlock my computer, all the windows
  are in the same position on the same monitor and desktop as I left
  them.

  What actually happens: When I unlock my computer, some or all of the
  windows have been changed to a random position on a random monitor
  and/or desktop.

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