*** This bug is a duplicate of bug 1813663 ***
    https://bugs.launchpad.net/bugs/1813663

Thank you for taking the time to report this bug and helping to make
Ubuntu better. This particular bug has already been reported and is a
duplicate of bug 1813663, so it is being marked as such. Please look at
the other bug report to see if there is any missing information that you
can provide, or to see if there is a workaround for the bug.
Additionally, any further discussion regarding the bug should occur in
the other report. Feel free to continue to report any other bugs you may
find.


** This bug has been marked a duplicate of bug 1813663
   External monitors does not work anymore 4.15.0-44

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https://bugs.launchpad.net/bugs/1814162

Title:
  Xorg freeze

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  When I lock my machine on the latest ubuntu version 4.15.0-44-generic,
  it turns my display completely black and unresponsive. This is only
  when I have my dock (with external displays in). After it freezes
  however, removing the dock has no effect. Booting back into
  4.15.0-43-generic has fixed the problem so this is a regression bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu7.1
  ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
  Uname: Linux 4.15.0-43-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jan 31 14:25:01 2019
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GpuHangFrequency: Several times a day
  GpuHangReproducibility: Yes, I can easily reproduce it
  GpuHangStarted: Immediately after installing this version of Ubuntu
  GraphicsCard:
   Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA 
controller])
     Subsystem: Dell UHD Graphics 620 [1028:081c]
  InstallationDate: Installed on 2018-10-17 (106 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  MachineType: Dell Inc. Latitude 7490
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/usr/bin/zsh
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-43-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/26/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.7.2
  dmi.board.name: 0KP0FT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.7.2:bd11/26/2018:svnDellInc.:pnLatitude7490:pvr:rvnDellInc.:rn0KP0FT:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: Latitude
  dmi.product.name: Latitude 7490
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.2
  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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