compiz team mailing list archive

[Daniel van Vugt <vanvugt@xxxxxxxxx>]

** Description changed:

  You might expect that with "Sync To VBlank" enabled in compiz that video
  tearing doesn't happen. But it does, just less often.
  
  This appears to be a regression in Ubuntu 11.10, because in 11.04 "Sync
  to VBlank" was working reliably and eliminated tearing.
  
  Strangely, disabling just the Unity plugin in CCSM solves the problem
  and all tearing goes away. This seems to be related to bug 861061 where
  the Unity plugin also degrades application frame rates. Both issues are
  instantly solved by disabling just the Unity plugin.
  
  WORKAROUND:
  
  In CCSM, Workarounds, enable "Force full screen redraw (buffer swap) on
- repaint".
+ repaint". With some graphics drivers like the NVIDIA proprietary one,
+ this workaround may introduce stuttering and halve the framerate you
+ see. That is expected with some drivers and is fixed by the same compiz
+ fix that is proposed for this bug.
  
- With some graphics drivers like the NVIDIA proprietary one, this
- workaround may introduce stuttering and halve the framerate you see.
- That is expected with some drivers and is fixed by the same compiz fix
- that is proposed for this bug.
+ If you are using the "nouveau" driver for NVIDIA chips, you will need to
+ enable Sync To VBlank support in the driver options because nouveau has
+ it disabled by default. You can do this be editing /etc/X11/xorg.conf
+ and adding:
  
+ # For nouveau only:
+ Section "Device"
+ 	Identifier "My Graphics"
+ 	Option "GLXVBlank" "on"
+ EndSection
+ 
+ Then log out and in again for it to take effect.
+ 
+ ----------------------
  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: compiz 1:0.9.6+bzr20110929-0ubuntu5
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  .tmp.unity.support.test.0:
  
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,mousepoll,place,gnomecompat,resize,imgpng,move,wall,regex,grid,vpswitch,animation,session,resizeinfo,unitymtgrabhandles,expo,workarounds,fade,scale,ezoom,unityshell]
  CompositorRunning: compiz
  Date: Mon Oct 24 16:01:07 2011
  DistUpgraded: Fresh install
  DistroCodename: oneiric
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0102] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:047e]
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: Dell Inc. OptiPlex 990
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_AU:en
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=c9a0c042-2d94-4c4b-bb7f-756faf723ada ro quiet splash intel_iommu=on vt.handoff=7
  SourcePackage: compiz
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/28/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0D6H9T
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 15
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd05/28/2011:svnDellInc.:pnOptiPlex990:pvr01:rvnDellInc.:rn0D6H9T:rvrA00:cvnDellInc.:ct15:cvr:
  dmi.product.name: OptiPlex 990
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu5
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.26-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
  version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

-- 
You received this bug notification because you are a member of compiz
packagers, which is subscribed to compiz in Ubuntu.
https://bugs.launchpad.net/bugs/880707

Title:
  [regression] Visible tearing occurs even when "Sync To VBlank" is
  enabled, but only when Unity is active.

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