Public bug reported: Steps to reproduce: connect a external monitor an login to unity -> the cpu usage of compiz increases insanely high by just moving some window around. In this state unity is not really usable.
There is no difference if the external monitor is used for output or not. It just have to be connected when login. And there are no problems when the monitor is unconnected when login and connected after. $ lsb_release -rd Description: Ubuntu Trusty Tahr (development branch) Release: 14.04 $ apt-cache policy compiz compiz: Installed: 1:0.9.11+14.04.20140328-0ubuntu1 Candidate: 1:0.9.11+14.04.20140328-0ubuntu1 Version table: *** 1:0.9.11+14.04.20140328-0ubuntu1 0 500 http://de.archive.ubuntu.com/ubuntu/ trusty/main i386 Packages 100 /var/lib/dpkg/status $ /usr/lib/nux/unity_support_test -p OpenGL vendor string: Intel Open Source Technology Center OpenGL renderer string: Mesa DRI Intel(R) 945GM x86/MMX/SSE2 OpenGL version string: 1.4 Mesa 10.1.0 Not software rendered: yes Not blacklisted: yes GLX fbconfig: yes GLX texture from pixmap: yes GL npot or rect textures: yes GL vertex program: yes GL fragment program: yes GL vertex buffer object: yes GL framebuffer object: yes GL version is 1.4+: yes Unity 3D supported: yes ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: compiz 1:0.9.11+14.04.20140328-0ubuntu1 ProcVersionSignature: Ubuntu 3.13.0-18.38-generic 3.13.6 Uname: Linux 3.13.0-18-generic i686 .tmp.unity.support.test.0: ApportVersion: 2.13.3-0ubuntu1 Architecture: i386 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity Date: Mon Mar 31 21:07:35 2014 DistUpgraded: Fresh install DistroCodename: trusty DistroVariant: ubuntu DkmsStatus: virtualbox, 4.3.6, 3.13.0-18-generic, i686: installed virtualbox, 4.3.6, 3.13.0-19-generic, i686: installed virtualbox, 4.3.6, 3.13.0-20-generic, i686: installed GraphicsCard: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03) (prog-if 00 [VGA controller]) Subsystem: Dell Device [1028:01bd] Subsystem: Dell Device [1028:01bd] InstallationDate: Installed on 2013-10-24 (157 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1) Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 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 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: Dell Inc. MM061 PackageArchitecture: all ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-18-generic root=UUID=7796fb02-f0a7-4355-988f-94862a77bffa ro quiet splash SourcePackage: compiz UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 06/13/2007 dmi.bios.vendor: Dell Inc. dmi.bios.version: A17 dmi.board.name: 0KD882 dmi.board.vendor: Dell Inc. dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA17:bd06/13/2007:svnDellInc.:pnMM061:pvr:rvnDellInc.:rn0KD882:rvr:cvnDellInc.:ct8:cvr: dmi.product.name: MM061 dmi.sys.vendor: Dell Inc. version.compiz: compiz 1:0.9.11+14.04.20140328-0ubuntu1 version.libdrm2: libdrm2 2.4.52-1 version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-1ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-1ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu7 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2 xserver.bootTime: Mon Mar 31 21:00:53 2014 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 43264 vendor LPL xserver.version: 2:1.15.0-1ubuntu7 ** Affects: compiz (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug compiz-0.9 i386 trusty ubuntu -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1300393 Title: Connected external monitor causes very high cpu usage by compiz To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1300393/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs