apport information

** Attachment added: "IwConfig.txt"
   
https://bugs.launchpad.net/bugs/1681040/+attachment/4858933/+files/IwConfig.txt

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https://bugs.launchpad.net/bugs/1681040

Title:
  Scaled display resolution is not detected correctly in lightdm display
  manager

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Environment:
  Ubuntu 16.04.2 LTS
  nvidia-375

  I have a laptop screen with resolution 3840x2160 and external display with 
resolution 3440x1440.
  I am scaling laptop display to resolution 1920x1080 with
  command nvidia-settings --attach CurrentMetaMode="DPY-0: nvidia-auto-select 
@3440x1440 +1920+0 {ViewPortIn=3440x1440, ViewPortOut=3440x1440+0+0}, DPY-3: 
nvidia-auto-select @1920x1080 +0+0 {ViewPortIn=1920x1080, 
ViewPortOut=3840x2160+0+0}"

  Bug: Display manager is not detecting scaled resolution correctly. Please see 
the attachment.
  Caused effect: When focus is on laptop display and pressing Alt + Tab the 
application switcher is not shown in center of laptop display but partly in 
external display.

  $ apt-cache policy lightdm
  lightdm:
    Installed: 1.18.3-0ubuntu1.1
    Candidate: 1.18.3-0ubuntu1.1
  --- 
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  markus     3264 F.... pulseaudio
   /dev/snd/controlC0:  markus     3264 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2017-04-07 (2 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 8087:0a2b Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: HP HP ZBook Studio G3
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  Package: linux (not installed)
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-46-generic.efi.signed 
root=UUID=2b78b572-05a1-4c01-b97d-9c1fea406faf ro quiet splash nomodeset 
pnpacpi=off vt.handoff=7
  ProcVersionSignature: Ubuntu 4.8.0-46.49~16.04.1-generic 4.8.17
  RelatedPackageVersions:
   linux-restricted-modules-4.8.0-46-generic N/A
   linux-backports-modules-4.8.0-46-generic  N/A
   linux-firmware                            1.157.8
  Tags:  xenial
  Uname: Linux 4.8.0-46-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 11/02/2016
  dmi.bios.vendor: HP
  dmi.bios.version: N82 Ver. 01.15
  dmi.board.name: 80D4
  dmi.board.vendor: HP
  dmi.board.version: KBC Version 11.67
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.modalias: 
dmi:bvnHP:bvrN82Ver.01.15:bd11/02/2016:svnHP:pnHPZBookStudioG3:pvr:rvnHP:rn80D4:rvrKBCVersion11.67:cvnHP:ct10:cvr:
  dmi.product.name: HP ZBook Studio G3
  dmi.sys.vendor: HP

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