Had the same symptoms with the latest 4.10.0 kernel. It seems to have gone away 
in 4.13
sudo apt-get install linux-image-4.13.0-21

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1705884

Title:
  Black screen

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  black screen when lock. Black screen not able to recover login info to
  re-enter gnome.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.10.0-27.30~16.04.2-generic 4.10.17
  Uname: Linux 4.10.0-27-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  Date: Sun Jul 23 11:29:32 2017
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  GraphicsCard:
   NVIDIA Corporation GF108 [GeForce GT 420] [10de:0de2] (rev a1) (prog-if 00 
[VGA controller])
     Subsystem: PC Partner Limited / Sapphire Technology GF108 [GeForce GT 420] 
[174b:1162]
  InstallationDate: Installed on 2017-06-04 (49 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215)
  MachineType: Packard Bell imedia S3810
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-27-generic 
root=UUID=61dd95f6-c8ec-48c9-82fd-87eee44dd781 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/19/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P01-A4
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: imedia S3810
  dmi.board.vendor: Packard Bell
  dmi.chassis.type: 3
  dmi.chassis.vendor: Packard Bell
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP01-A4:bd08/19/2010:svnPackardBell:pnimediaS3810:pvr:rvnPackardBell:rnimediaS3810:rvr:cvnPackardBell:ct3:cvr:
  dmi.product.name: imedia S3810
  dmi.sys.vendor: Packard Bell
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.70-1~ubuntu16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.6-0ubuntu0.16.04.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.6-0ubuntu0.16.04.1
  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

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