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[Vindicator <1516531@xxxxxxxxxxxxxxxxxx>]

What motherboard and CPU are you using Miklos?

I never bothered trying xenial and went straight to archlinux w/kde.

The issue seems to be driver/xorg related and I had submitted a bug report to KDE when I encountered a similar issue (kde drops back out to login screen instead of freezing the gui).
There is a workaround and if your motherboard and cpu look like the workaround will be applicable, I'll post the link to the report.

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https://bugs.launchpad.net/bugs/1516531

Title:
  Fullscreen Freeze.

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  Related?:
  http://askubuntu.com/questions/692405/ubuntu-15-10-unity-freezes-after-escaping-full-screen-video
  https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1509622

  I've been having cases of unusual screen behavior, particularly when Kodi 16 is being used (maybe it's just a Kodi thing).
  There have been times before when coming out of fullscreen video using either Chrome or Kodi would drop me to a console screen with no input.
  I think I would be able to kill the gnome session in tty1.

  Now, after a bios upgrade as well as the latest display manager and kernel update, Kodi has frozen in fullscreen a couple of times and yet audio will still play from Kodi.
  I created the bug report in tty1.

  I've also been noticing that if I pause a Kodi video, other non-Kodi applications may not update their window content.
  For example, I may be in a webpage in Chrome and I try to mousewheel scroll, yet not see the scrolling effect. Or I will click on a different tab and the window doesn't show the switch. BUT, if I continue playing the Kodi video, Chrome will update it's screen, and if I switch back to the tab I scrolled, the scroll will have already occurred.

  I will say that I have at least not had a fullscreen GUI crash me out
  to console.

  Another peculiarity is when booting Ubuntu, I used to be able to press ESC to view the kernel/system booting output, but now it just shows a black screen with a cursor.
  The downside to that in 15.04 was I'd lose my mouse cursor when the GUI login screen came up.

  Let me know what other output you'd like (or whatever test you'd like me to try) "when" it happens again.
  --- 
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroRelease: Ubuntu 15.10
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 4th Generation Core Processor Family Integrated Graphics Controller [8086:041e] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: ASRock Incorporation Device [1849:041e]
  InstallationDate: Installed on 2015-10-28 (26 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  Package: xorg 1:7.7+7ubuntu4
  PackageArchitecture: amd64
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-19-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro noprompt quiet splash elevator=cfq vt.handoff=7
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Tags:  wily ubuntu compiz-0.9
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  Uname: Linux 4.2.0-19-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 07/27/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.80
  dmi.board.name: H97M-ITX/ac
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.80:bd07/27/2015:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnH97M-ITX/ac:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Mon Nov 23 21:36:32 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               47908 
   vendor                                     BBY
  xserver.version: 2:1.17.2-1ubuntu9.1

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