Public bug reported:

On a laptop with a 4K display but at 1920x1080 resolution setting:

When login in a new session, the mouse cursor has a huge size.
To fix the problem, at every new session login :
+ Open "Mouse and trackpad settings"
+ Switch to mouse "Theme" tab
+ Choose another theme and get back 'default' theme
= the mouse pointer has now a normal size

Remarks:
+ On login screen, the screen resolution is 4K (3840x2160)
+ My session is configured to be 1920x1080
+ This bug occurs either with nouveau or nvidia driver

Additional information:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 15.10
Release:        15.10
Codename:       wily

$ xfce4-mouse-settings --version
xfce4-mouse-settings 4.12.0 (Xfce 4.12)

$ lspci | grep -ie vga -ie 3d
00:02.0 VGA compatible controller: Intel Corporation Device 191b (rev 06)
02:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2)

$ dpkg -l | grep nvidia
ii  nvidia-358                                                  
358.16-0ubuntu0~gpu15.10.2                 amd64        NVIDIA binary driver - 
version 358.16
ii  nvidia-opencl-icd-358                                       
358.16-0ubuntu0~gpu15.10.2                 amd64        NVIDIA OpenCL ICD
ii  nvidia-prime                                                0.8.1           
                           amd64        Tools to enable NVIDIA's Prime
ii  nvidia-settings                                             
361.28-0ubuntu0~gpu15.10.1                 amd64        Tool for configuring 
the NVIDIA graphics driver

$ prime-select query
nvidia

$ uname -a
Linux sancho-Inspiron-7559 4.2.0-30-generic #36-Ubuntu SMP Fri Feb 26 00:58:07 
UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

+xpdyinfo attachment

** Affects: xfce4-settings (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 4k xfce4-mouse-settings

** Attachment added: "xpdyinfo"
   https://bugs.launchpad.net/bugs/1552133/+attachment/4586303/+files/xdpy.info

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https://bugs.launchpad.net/bugs/1552133

Title:
  Big mouse pointer at login with 4K display but at 1920x1080 screen
  configuration

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