Looking at your original description, though, you claim that Unity2D is unaffected. If this is true then I'm guessing that either the driver is having issues with compositors + hardcore video playback or that both compiz or mutter are having the same issue.
** Description changed: - Choppy video playback under Unity, but not Unity 2D with VLC and - Mplayer. Tried different video outputs, but none of them fixed the - problem. It looks like the video is running at about 20 fps, but both - VLC and Mplayer doesn't show dropped frames. CPU usage is only 50%. + Choppy video playback under Unity and Gnome Shell, but not Unity 2D with + VLC and Mplayer. Tried different video outputs, but none of them fixed + the problem. It looks like the video is running at about 20 fps, but + both VLC and Mplayer doesn't show dropped frames. CPU usage is only 50%. Using compiz under Unity 2D results in stuttering too. Experiencing the same with a Radeon HD6450 using the open source driver. 12.04 Live CD (2012.03.21.) with unity 5.6.0-0ubuntu4 ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: compiz 1:0.9.7.0+bzr3035-0ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-19.30-generic-pae 3.2.11 Uname: Linux 3.2.0-19-generic-pae i686 .tmp.unity.support.test.0: ApportVersion: 1.94.1-0ubuntu2 Architecture: i386 CasperVersion: 1.312 CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell] CompositorRunning: compiz Date: Wed Mar 21 13:25:50 2012 DistUpgraded: Fresh install DistroCodename: precise DistroVariant: ubuntu GraphicsCard: Advanced Micro Devices [AMD] nee ATI RC410 [Radeon Xpress 200M] [1002:5a62] (prog-if 00 [VGA controller]) Subsystem: Toshiba America Info Systems Device [1179:ff31] LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120321) Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 003: ID 0951:162c Kingston Technology Bus 002 Device 002: ID 0458:003a KYE Systems Corp. (Mouse Systems) NetScroll+ Mini Traveler / Genius NetScroll 120 MachineType: TOSHIBA Satellite L30 PackageArchitecture: all PccardctlIdent: Socket 0: no product info available PccardctlStatus: Socket 0: no card ProcEnviron: TERM=xterm LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: initrd=/casper/initrd.lz file=/cdrom/preseed/hostname.seed boot=casper quiet splash -- BOOT_IMAGE=/casper/vmlinuz SourcePackage: compiz UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/17/2007 dmi.bios.vendor: TOSHIBA dmi.bios.version: V3.00 dmi.board.name: Satellite L30 dmi.board.vendor: TOSHIBA dmi.board.version: Not Applicable dmi.chassis.type: 10 dmi.chassis.vendor: TOSHIBA dmi.chassis.version: N/A dmi.modalias: dmi:bvnTOSHIBA:bvrV3.00:bd08/17/2007:svnTOSHIBA:pnSatelliteL30:pvrPSL33E-00E00XHU:rvnTOSHIBA:rnSatelliteL30:rvrNotApplicable:cvnTOSHIBA:ct10:cvrN/A: dmi.product.name: Satellite L30 dmi.product.version: PSL33E-00E00XHU dmi.sys.vendor: TOSHIBA version.compiz: compiz 1:0.9.7.0+bzr3035-0ubuntu1 version.libdrm2: libdrm2 2.4.30-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.1-0ubuntu5 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.1-0ubuntu5 version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu7 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in Ubuntu. https://bugs.launchpad.net/bugs/961124 Title: Choppy video playback To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/961124/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
