Public bug reported:

The position of the secondary display can not be applied with scales of 200% 
and 300%.
Can be modified with scale of 100% after modified some other configuration like 
Single Display scale. After set a new position of the secondary display (with 
100% scale) is not possible to change the scale maintaining the actual 
position. 

Using also Nvidia driver 384.90

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: xorg 1:7.7+19ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
NonfreeKernelModules: wl nvidia_uvm nvidia_drm nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  384.90  Tue Sep 19 19:17:35 
PDT 2017
 GCC version:  gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu3)
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Fri Oct 20 14:02:12 2017
DistUpgraded: 2017-10-20 13:15:46,366 DEBUG icon theme changed, re-reading
DistroCodename: artful
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation 4th Gen Core Processor Integrated Graphics Controller 
[8086:0416] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Lenovo 4th Gen Core Processor Integrated Graphics Controller 
[17aa:3978]
   Subsystem: Lenovo GM107M [GeForce GTX 960M] [17aa:3978]
InstallationDate: Installed on 2017-08-23 (57 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
LightdmDisplayLog: (II) Server terminated successfully (0). Closing log file.
MachineType: LENOVO 20349
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic.efi.signed 
root=UUID=0f865fdf-a3ef-4fd1-88f3-80f6ca16ef1c ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to artful on 2017-10-20 (0 days ago)
dmi.bios.date: 02/11/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: 9ECN37WW(V2.01)
dmi.board.asset.tag: 31900058WIN
dmi.board.name: Lenovo Y50-70 Touch
dmi.board.vendor: LENOVO
dmi.board.version: 31900058WIN
dmi.chassis.asset.tag: 31900058WIN
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Y50-70 Touch
dmi.modalias: 
dmi:bvnLENOVO:bvr9ECN37WW(V2.01):bd02/11/2015:svnLENOVO:pn20349:pvrLenovoY50-70Touch:rvnLENOVO:rnLenovoY50-70Touch:rvr31900058WIN:cvnLENOVO:ct10:cvrLenovoY50-70Touch:
dmi.product.family: IDEAPAD
dmi.product.name: 20349
dmi.product.version: Lenovo Y50-70 Touch
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.13.1+17.10.20170901-0ubuntu1
version.libdrm2: libdrm2 2.4.83-1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.2-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.2-0ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20170309-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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


** Tags: amd64 apport-bug artful ubuntu

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https://bugs.launchpad.net/bugs/1725360

Title:
  Secondary display can not be set

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