Public bug reported:

This might be a regression where the original issue is:
https://bugs.launchpad.net/xorg-server/+bug/883319

It can be easily reproduced by doing something like:

    xrandr --output DP1 --scale 1.25x1.25

The mouse will be still constrained to the native solution (aka you
can't move the mouse outside a box of whatever DP1 had as resolution
before.

$ lsb_release -rd
Description:    Ubuntu 16.04 LTS
Release:        16.04

$ xrandr --version
xrandr program version       1.5.0
Server reports RandR version 1.5

$ apt-cache policy xserver-xorg-core
xserver-xorg-core:
  Installed: 2:1.18.3-1ubuntu2

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: xenial

** Description changed:

  This might be a regression where the original issue is:
  https://bugs.launchpad.net/xorg-server/+bug/883319
  
  It can be easily reproduced by doing something like:
  
+     xrandr --output DP1 --scale 1.25x1.25
  
-     xrandr --output DP1 --scale 1.25x1.25
- 
- The mouse will be still constrained to the native solution (aka you can't 
move the mouse outside a box of whatever DP1 had as resolution before.
-  
+ The mouse will be still constrained to the native solution (aka you
+ can't move the mouse outside a box of whatever DP1 had as resolution
+ before.
  
  $ lsb_release -rd
  Description:  Ubuntu 16.04 LTS
  Release:      16.04
  
  $ xrandr --version
  xrandr program version       1.5.0
  Server reports RandR version 1.5
+ 
+ $ apt-cache policy xserver-xorg-core
+ xserver-xorg-core:
+   Installed: 2:1.18.3-1ubuntu2

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https://bugs.launchpad.net/bugs/1580123

Title:
  xrandr --scale (again) confines mouse to native solution

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