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[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

Two issues here:

1. The intel kernel driver does/did on rare occasions lose vsync. That's
a kernel issue which will go away on reboot. But also probably not the
main problem.

2. Fullscreen windows in Unity7/Compiz get "unredirected" for
performance so they are not composited by Compiz any more. This means
they will tear unless "unredirection" is explicitly disabled for them:

    $ sudo apt-get install compizconfig-settings-manager
    $ ccsm 
   General > Composite > General > 

Now either add a match for Chromium into "Unredirect Match" (if you can
figure out how), or to simply disable the feature for all apps untick
"Unredirect Fullscreen Windows". Tearing eliminated.

Also check the default settings for avoiding tearing are in place in CCSM:
   General > OpenGL > General > Always use buffer swapping = ON (means it won't tear)


** Summary changed:

- Tearing in video playback
+ Tearing in Chrome/Chromium fullscreen video playback

** Package changed: chromium-browser (Ubuntu) => compiz (Ubuntu)

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Packages, which is subscribed to chromium-browser in Ubuntu.
https://bugs.launchpad.net/bugs/1509044

Title:
  Tearing in Chrome/Chromium fullscreen video playback

Status in Compiz:
  Confirmed
Status in compiz package in Ubuntu:
  Confirmed

Bug description:
  Example video: https://youtu.be/ZCPkOpMHB7g (HTML5 player)

  lspci -vvv|grep -A 12 "VGA compatible"
  00:02.0 VGA compatible controller: Intel Corporation 82Q963/Q965 Integrated Graphics Controller (rev 02) (prog-if 00 [VGA controller])
  	Subsystem: Dell Device 01da
  	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
  	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
  	Latency: 0
  	Interrupt: pin A routed to IRQ 43
  	Region 0: Memory at fea00000 (32-bit, non-prefetchable) [size=1M]
  	Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
  	Region 4: I/O ports at ecb8 [size=8]
  	Expansion ROM at <unassigned> [disabled]
  	Capabilities: <access denied>
  	Kernel driver in use: i915

  After I added this in 
  /etc/X11/xorg.conf.d/20-intel.conf, tearing disappeared in Firefox, but not in Chromium:

  Section "Device"
     Identifier  "Intel Graphics"
     Driver      "intel"
     Option      "TearFree"    "true"
  EndSection

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: chromium-browser 45.0.2454.101-0ubuntu0.14.04.1.1099
  ProcVersionSignature: Ubuntu 3.13.0-66.108-lowlatency 3.13.11-ckt27
  Uname: Linux 3.13.0-66-lowlatency x86_64
  ApportVersion: 2.14.1-0ubuntu3.15
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Thu Oct 22 21:23:32 2015
  Desktop-Session:
   'xfce'
   '/etc/xdg/xdg-xfce:/usr/share/upstart/xdg:/etc/xdg:/etc/xdg'
   '/usr/share/xfce:/usr/share/xfce4:/usr/local/share/:/usr/share/:/usr/share'
  DetectedPlugins:
   
  EcryptfsInUse: Yes
  Env:
   'None'
   'None'
  InstallationDate: Installed on 2014-09-21 (396 days ago)
  InstallationMedia: Ubuntu-Studio 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.1)
  Load-Avg-1min: 1.55
  Load-Processes-Running-Percent:   0.2%
  MachineType: Dell Inc. OptiPlex 745
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-66-lowlatency root=UUID=d012c1bd-7e56-4035-b321-38d20cb14421 ro quiet splash vt.handoff=7
  SourcePackage: chromium-browser
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/26/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.6.6
  dmi.board.name: 0RF703
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr2.6.6:bd06/26/2011:svnDellInc.:pnOptiPlex745:pvr:rvnDellInc.:rn0RF703:rvr:cvnDellInc.:ct6:cvr:
  dmi.product.name: OptiPlex 745
  dmi.sys.vendor: Dell Inc.
  gconf-keys: /desktop/gnome/applications/browser/exec = b'firefox\n'/desktop/gnome/url-handlers/https/command = b'sensible-browser %s\n'/desktop/gnome/url-handlers/https/enabled = b'true\n'/desktop/gnome/url-handlers/http/command = b'sensible-browser %s\n'/desktop/gnome/url-handlers/http/enabled = b'true\n'/desktop/gnome/session/required_components/windowmanager = b''/apps/metacity/general/compositing_manager = b''/desktop/gnome/interface/icon_theme = b'elementary-xfce-dark\n'/desktop/gnome/interface/gtk_theme = b'Greybird\n'
  modified.conffile..etc.default.chromium.browser: [deleted]
  mtime.conffile..etc.chromium.browser.default: 2014-09-28T10:04:54.426898

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