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[Wouter van Os <wouter@xxxxxxxxxxxxx>]

I'm also experiencing this exact problem for some months now (using
Ubuntu 14.10 and 14.04) with an Intel and Nvidia (Optimus) graphic
cards..

Workaround seems to work well here. The only thing is that my windows on
other workspaces are going back to the main screen, which is obvious.

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https://bugs.launchpad.net/bugs/1313436

Title:
  Unity/Compiz very slow after resume from suspend

Status in Unity:
  Confirmed
Status in unity package in Ubuntu:
  Confirmed

Bug description:
  After suspending and then resuming the system unity/compiz often but
  not always becomes extremely slow to respond, so much so that you can
  see the transistion from lockscreen to desktop for many minutes (if it
  ever finishes). I will attach a picture of what it looks like. I
  didn't wait around long enough to see if it would ever actually finish
  showing the desktop.

  Is there any way to work around this issue? setsid unity has been
  mentioned online as a workaround for unity/compiz problems but that
  does not appear to work when run from the linux command line outside
  of X.

  The system has never been able to run the nouveau driver due to it
  crashing on resume under any desktop environment, which is the primary
  reason its running the nvidia driver which has worked fine for the
  past 5 years I've owned the system.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  304.117  Tue Nov 26 21:25:36 PST 2013
   GCC version:  gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  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: Sun Apr 27 15:14:01 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus: nvidia-304, 304.117, 3.13.0-24-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   NVIDIA Corporation G73 [GeForce 7600 GT] [10de:0391] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Gigabyte Technology Co., Ltd Device [1458:3417]
  InstallationDate: Installed on 2014-04-25 (2 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Gigabyte Technology Co., Ltd. P55-UD5
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=4cbdddb9-1645-4914-b056-903626ac77cf ro quiet splash
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/09/2010
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F11c
  dmi.board.name: P55-UD5
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF11c:bd11/09/2010:svnGigabyteTechnologyCo.,Ltd.:pnP55-UD5:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP55-UD5:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: P55-UD5
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  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: Sun Apr 27 15:10:24 2014
  xserver.configfile: default
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:

  xserver.version: 2:1.15.1-0ubuntu2

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