Comment 62 for bug 1295267

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.