A clean install of 16.04 has fixed this issue for me.

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https://bugs.launchpad.net/bugs/1771062

Title:
  LG 27UK650 Monitor Won't Come Back On After Inactivity Turn Off

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  After Ubuntu 16.04.4 turns off my monitor (due to inactivity timeout),
  I cannot get it to come back on without rebooting.

  Monitor: LG 27UK650
  Specs:   
http://www.lg.com/us/support/products/documents/27UK650-W%20Spec%20Sheet.pdf

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.13.0-41.46~16.04.1-generic 4.13.16
  Uname: Linux 4.13.0-41-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  384.111  Tue Dec 19 23:51:45 
PST 2017
   GCC version:  gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.9)
  .tmp.unity_support_test.0:

  ApportVersion: 2.20.1-0ubuntu2.17
  Architecture: amd64
  BootLog:

  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Mon May 14 01:15:22 2018
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.8, 4.13.0-41-generic, x86_64: installed
   nvidia-384, 384.111, 4.13.0-41-generic, x86_64: installed
   virtualbox, 5.1.34, 4.13.0-41-generic, x86_64: installed
   virtualbox, 5.1.34, 4.4.0-124-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   NVIDIA Corporation Device [10de:1be1] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: CLEVO/KAPOK Computer Device [1558:087a]
  InstallationDate: Installed on 2018-05-12 (2 days ago)
  InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 
(20180228)
  MachineType: System76 Bonobo WS
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-41-generic.efi.signed 
root=UUID=905343e7-683c-43f3-9ee8-b5e8909f865b ro acpi_backlight=vendor quiet 
splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/12/2017
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.05.04RSA5
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: Bonobo WS
  dmi.board.vendor: System76
  dmi.board.version: bonw13
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: System76
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1.05.04RSA5:bd12/12/2017:svnSystem76:pnBonoboWS:pvrbonw13:rvnSystem76:rnBonoboWS:rvrbonw13:cvnSystem76:ct10:cvrN/A:
  dmi.product.family: Not Applicable
  dmi.product.name: Bonobo WS
  dmi.product.version: bonw13
  dmi.sys.vendor: System76
  version.compiz: compiz 1:0.9.12.3+16.04.20180221-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.83-1~16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.8-0ubuntu0~16.04.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.8-0ubuntu0~16.04.1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Mon May 14 01:02:31 2018
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:

  xserver.version: 2:1.19.5-0ubuntu2~16.04.1

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