Many bugs are now accumulating with this and similar issues surrounding Xorg.  
This is just one example 
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1764087
There are others.  Some are related to Lenovo laptops but not all.
Shame that 18.04 LTS has been allowed to be released without this inherent bug 
being fixed.  It is damaging Ubuntu reputation.

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https://bugs.launchpad.net/bugs/1769270

Title:
  Xorg freeze

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  I have a Lenovo T430.
  When I reboot the screen will freeze (requires reboot) before the login 
prompt if I have both my digital display port and vga plugged in while my 
laptop is open. If I unplug the external monitors it boots fine. If I boot then 
quickly close the laptop screen it boots fine.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu7
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Fri May  4 14:14:56 2018
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: Continuously
  GpuHangReproducibility: Yes, I can easily reproduce it
  GpuHangStarted: Immediately after installing this version of Ubuntu
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] 
(rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo 3rd Gen Core processor Graphics Controller [17aa:21f3]
  InstallationDate: Installed on 2018-05-04 (0 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  MachineType: LENOVO 23472P2
  ProcEnviron:
   PATH=(custom, no User Name)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-20-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/08/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G1ET93WW (2.53 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 23472P2
  dmi.board.vendor: LENOVO
  dmi.board.version: Win8 Pro DPK TPG
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrG1ET93WW(2.53):bd03/08/2013:svnLENOVO:pn23472P2:pvrThinkPadT430:rvnLENOVO:rn23472P2:rvrWin8ProDPKTPG:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.family: ThinkPad T430
  dmi.product.name: 23472P2
  dmi.product.version: ThinkPad T430
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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