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Message #25169
[Bug 880707] Re: [regression] Visible tearing occurs even when "Sync To VBlank" is enabled, but only when Unity is active.
** 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".
+
+ 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.
+
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/compiz-core/+bug/880707/+subscriptions
References