** Description changed:

- It looks that the sequence of frames displayed at the screen is mixed up. The 
display goes back say ¼ a second and that gives a very strange effect. You type 
a letter, that letter is erased afterwards and reappears after ¼ of a second. 
See the ATTACHED video. You see the same type of going back a number of frames 
in e.g. YouTube videos, which gives a jittery effect.
- The problem only occurs if I have 3D acceleration enabled in Virtualbox and 
it occurred with both Ubuntu 16.04 and 17.10 hosts. It only occurs at Ubuntu 
16.04 guests, the problem does not occur in Ubuntu 17.10 nor in other Linux 
distros including Ubuntu Mate and Xubuntu. I use Virtualbox 5.2.6 with Guest 
Additions 5.2.7 as recommended by Oracle on their website.
+ It looks that the sequence of frames displayed at the screen is mixed
+ up. The display goes back say ¼ a second and that gives a very strange
+ effect. You type a letter, that letter is erased afterwards and
+ reappears after ¼ of a second. See the ATTACHED video. You see the same
+ type of going back a number of frames in e.g. YouTube videos, which
+ gives a jittery effect.
+ 
+ See also the Conky graphs going sometimes backward in both videos :)
+ 
+ The problem only occurs if I have 3D acceleration enabled in Virtualbox
+ and it occurred with both Ubuntu 16.04 and 17.10 hosts. It only occurs
+ at Ubuntu 16.04 guests, the problem does not occur in Ubuntu 17.10 nor
+ in other Linux distros including Ubuntu Mate and Xubuntu. I use
+ Virtualbox 5.2.6 with Guest Additions 5.2.7 as recommended by Oracle on
+ their website.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.13.0-36.40~16.04.1-generic 4.13.13
  Uname: Linux 4.13.0-36-generic x86_64
  .tmp.unity_support_test.0:
  
  ApportVersion: 2.20.1-0ubuntu2.15
  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
  CurrentDesktop: Unity
  Date: Thu Feb 22 23:35:36 2018
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter 
[80ee:beef] (prog-if 00 [VGA controller])
  InstallationDate: Installed on 2017-03-29 (330 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: innotek GmbH VirtualBox
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-36-generic 
root=UUID=82019235-3f7b-4b99-b622-d6bb790566d5 ro quiet splash zswap.enabled=1
  Renderer: Software
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: 
dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.family: Virtual Machine
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH
  version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
  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.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: Thu Feb 22 23:13:23 2018
  xserver.configfile: default
  xserver.errors:
   Failed to load module "vboxvideo" (module does not exist, 0)
   Failed to load module "vboxvideo" (module does not exist, 0)
   modeset(0): glamor initialization failed
   AIGLX: reverting to software rendering
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.19.5-0ubuntu2~16.04.1
  xserver.video_driver: modeset

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https://bugs.launchpad.net/bugs/1751191

Title:
  Using Vbox with 3D enabled, creates strange stuttering

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