Public bug reported:

xdypinfo reports wrong screen dimensions and resolution (always 96x96
dpi).

$  xdpyinfo | grep -B2 resolution
screen #0:
  dimensions:    3840x2160 pixels (1016x571 millimeters)
  resolution:    96x96 dots per inch


However, xrandr reports the right dimensions:

$ xrandr
Screen 0: minimum 8 x 8, current 3840 x 2160, maximum 32767 x 32767
DP1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 
600mm x 340mm

$ lsb_release -rd
Description:    Ubuntu 16.04.1 LTS
Release:        16.04

$ apt-cache policy xorg
xorg:
  Installiert:           1:7.7+13ubuntu3
  Installationskandidat: 1:7.7+13ubuntu3
  Versionstabelle:
 *** 1:7.7+13ubuntu3 500
        500 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

As suggested in https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/201491/comments/23 I filed a new report for this.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: KDE
Date: Sun Sep  4 22:53:47 2016
InstallationDate: Installed on 2016-09-03 (1 days ago)
InstallationMedia: Kubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug third-party-packages xenial

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https://bugs.launchpad.net/bugs/1620123

Title:
  xdpyinfo reports wrong screen dimensions

Status in xorg package in Ubuntu:
  New

Bug description:
  xdypinfo reports wrong screen dimensions and resolution (always 96x96
  dpi).

  $  xdpyinfo | grep -B2 resolution
  screen #0:
    dimensions:    3840x2160 pixels (1016x571 millimeters)
    resolution:    96x96 dots per inch

  
  However, xrandr reports the right dimensions:

  $ xrandr
  Screen 0: minimum 8 x 8, current 3840 x 2160, maximum 32767 x 32767
  DP1 connected primary 3840x2160+0+0 (normal left inverted right x axis y 
axis) 600mm x 340mm

  $ lsb_release -rd
  Description:    Ubuntu 16.04.1 LTS
  Release:        16.04

  $ apt-cache policy xorg
  xorg:
    Installiert:           1:7.7+13ubuntu3
    Installationskandidat: 1:7.7+13ubuntu3
    Versionstabelle:
   *** 1:7.7+13ubuntu3 500
          500 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  As suggested in https://bugs.launchpad.net/ubuntu/+source/xorg-
  server/+bug/201491/comments/23 I filed a new report for this.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
  Uname: Linux 4.4.0-36-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Sun Sep  4 22:53:47 2016
  InstallationDate: Installed on 2016-09-03 (1 days ago)
  InstallationMedia: Kubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)

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