** Also affects: ubutter
Importance: Undecided
Status: New
** Changed in: ubutter
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/880707
Title:
[regression] Compiz: Visible tearing is worse in 11.10 than 11.04,
even when "Sync To VBlank" is enabled, but only when Unity is active.
Status in Compiz Core:
Fix Released
Status in Ubutter: Making Ubuntu buttery smooth:
Fix Released
Status in Unity:
Fix Released
Status in “compiz” package in Ubuntu:
Fix Released
Status in “unity” package in Ubuntu:
Fix Released
Bug description:
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.
USERS OF THE NOUVEAU DRIVER:
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 by 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.
USERS OF THE CATALYST (FGLRX) DRIVER:
The fglrx driver also disables Sync to VBlank support by default. To fix this:
1. Open Catalyst Control Center.
2. Go to 3D > More Settings.
3. Set "Wait for vertical refresh" to "On, unless application specifies".
----------------------
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
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