marked this fix-released.
I dont see the problem any more.
It is possible it still affects 4.4 series, but bionic is fine for sure.

** Changed in: linux (Ubuntu)
       Status: Confirmed => Fix Released

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  screen goes completely black during usage then comes back

Status in linux package in Ubuntu:
  Fix Released
Status in xorg-server package in Ubuntu:

Bug description:
  just upgraded and rebooted (been quite a while since I rebooted so lots of 
things probably changed in the mix).

  The system initially logged in and my screen layout was lost (instead
  ie, the monitor on the left was on the right).  I changed that back,
  logged out and back in.

  Now, occasionally and seemingly randomly the larger display goes black for 
1-2 seconds during usage.
  It often occurs when switching desktops via hotkeys, but sometimes at other 
random points.

  After playing a bit, I'm pretty sure the reason is that I'm getting
  the vesa driver instead of the intel one.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
  Uname: Linux 4.4.0-31-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl

  ApportVersion: 2.20.2-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for 
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Wed Jul 20 09:26:52 2016
  DistUpgraded: Fresh install
  DistroCodename: yakkety
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes
   Intel Corporation HD Graphics 6000 [8086:1626] (rev 09) (prog-if 00 [VGA 
     Subsystem: Intel Corporation HD Graphics 6000 [8086:2057]
  InstallationDate: Installed on 2015-07-23 (363 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic.efi.signed 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  version.compiz: compiz 1:
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.68-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.1-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.1-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-2
  xserver.bootTime: Wed Jul 20 09:18:57 2016
  xserver.configfile: default
   modeset(0): failed to set mode: Invalid argument
   modeset(0): failed to set mode: Invalid argument
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.4-1ubuntu1
  xserver.video_driver: modeset

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