Public bug reported:

In that system only one display port is attached as seen by driver/X,
but the image is displayed on both screen, but mirrored, when I switch
to resolution 3840x1080 the image is stretched on both full hd displays.
The drawback of this situation is when I want to stretch to fullscreen
it stretches on both screens treated as one. This is not the case under
Windows.

Screen 0: minimum 320 x 200, current 3286 x 1080, maximum 16384 x 16384
eDP connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 
277mm x 156mm
   1366x768      60.06*+  40.04  
   1280x720      59.86  
   1152x768      59.78  
   1024x768      59.92  
   800x600       59.86  
   848x480       59.66  
   720x480       59.71  
   640x480       59.38  
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 connected 1920x1080+1366+0 (normal left inverted right x axis y 
axis) 509mm x 286mm
   1920x1080     60.00*+
   3840x1080     60.00  
   2560x1024     60.00  
   1680x1050     59.95  
   1600x900      60.00  
   1280x1024     60.02  
   1440x900      59.89  
   1280x720      60.00  
   1024x768      60.00  
   800x600       60.32  
   640x480       59.94  
   720x400       70.08

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: linux-signed-image-generic 4.8.0.22.31
ProcVersionSignature: Ubuntu 4.8.0-22.24-generic 4.8.0
Uname: Linux 4.8.0-22-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Dec  6 19:19:26 2016
MachineType: HP HP EliteBook 725 G3
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi 
file=/cdrom/preseed/username.seed boot=casper quiet splash ---
RelatedPackageVersions:
 linux-restricted-modules-4.8.0-22-generic N/A
 linux-backports-modules-4.8.0-22-generic  N/A
 linux-firmware                            1.161
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/29/2016
dmi.bios.vendor: HP
dmi.bios.version: N73 Ver. 01.12
dmi.board.name: 8084
dmi.board.vendor: HP
dmi.board.version: KBC Version 75.48
dmi.chassis.asset.tag: 5CG6255NMM
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.modalias: 
dmi:bvnHP:bvrN73Ver.01.12:bd04/29/2016:svnHP:pnHPEliteBook725G3:pvr:rvnHP:rn8084:rvrKBCVersion75.48:cvnHP:ct10:cvr:
dmi.product.name: HP EliteBook 725 G3
dmi.sys.vendor: HP

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug yakkety

** Attachment added: "Screenshot from 2016-12-06 19-06-21.png"
   
https://bugs.launchpad.net/bugs/1647812/+attachment/4788218/+files/Screenshot%20from%202016-12-06%2019-06-21.png

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https://bugs.launchpad.net/bugs/1647812

Title:
  HP EliteBook 725 G3 docked see only one DisplayPort attached

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