Public bug reported:

while the laptop is in the docking station there is no output on any monitor as 
long as i'm not logged into kde.
The output stops right after the password for the encrypted root disk and the 
screens stay blank until i login to kde
if i start outside the docking station i get output on the screen through the 
whole boot process including the login process for kde

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
Uname: Linux 4.4.0-45-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: KDE
Date: Fri Nov 18 12:16:26 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: kubuntu
ExtraDebuggingInterest: No
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 
09) (prog-if 00 [VGA controller])
   Subsystem: Dell 3rd Gen Core processor Graphics Controller [1028:0535]
MachineType: Dell Inc. Latitude E6530
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-45-generic.efi.signed 
root=/dev/mapper/system-root_crypt ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/19/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A17
dmi.board.name: 0JC5MT
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA17:bd08/19/2015:svnDellInc.:pnLatitudeE6530:pvr01:rvnDellInc.:rn0JC5MT:rvrA01:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6530
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.2
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2.2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2.2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Mon Nov 14 11:57:52 2016
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                 812 
 vendor                                     LGD
xserver.version: 2:1.18.4-0ubuntu0.1

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


** Tags: amd64 apport-bug kubuntu xenial

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https://bugs.launchpad.net/bugs/1642929

Title:
  no screen output prior to login while in docking station

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