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["Nathaniel W. Turner" <nate@xxxxxxxxxxxxxxx>]

Marco, sorry for not following up. I reluctantly stopped using Unity
awhile back because it was too buggy (and I couldn't get any work done).
Hopefully you've been able to reproduce this.

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https://bugs.launchpad.net/bugs/1281806

Title:
  Alt-Tab switcher regularly goes into "flicker loop of death" or just
  hangs

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

Bug description:
  Recently when doing Alt-Tab (and Alt-`) to switch between windows, the
  rectangle display showing the icons for all the applications and
  windows will suddenly start flickering rapidly and the whole X
  sessions will become unresponsive to keypresses and mouse actions.
  Sometimes instead of flickering, the Alt-Tab display will simply fail
  to appear and the same unresponsive X session results.

  This seems to happen very frequently during the course of a day. When
  it happens, my only recourse is to press Ctrl-Alt-F2 to get a text
  console, log in, and run "killall compiz" and then "DISPLAY=:0
  metacity" to kill the hung window manager and start a new one. (I
  tried running "DISPLAY=:0 compiz" from VT2, but that doesn't seem to
  start compiz in a fully functional manner.)

  I'm reporting this from a system with an NVidia card, but I experience
  the same thing on another system using an ATI "Radeon HD 7970/R9 280X"
  card, so I don't think it's video-driver specific.

  Needless to say, this makes Unity pretty hard to use effectively.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.1.2+14.04.20140217-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-8.28-generic 3.13.2
  Uname: Linux 3.13.0-8-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/Linaro 4.8.2-14ubuntu4)
  .tmp.unity.support.test.0:

  ApportVersion: 2.13.2-0ubuntu4
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,decor,mousepoll,grid,vpswitch,compiztoolbox,imgpng,gnomecompat,regex,move,place,resize,snap,unitymtgrabhandles,wall,animation,session,expo,workarounds,fade,ezoom,scale,unityshell]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Tue Feb 18 15:24:16 2014
  DistUpgraded: 2014-01-22 19:30:50,196 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   nvidia-304-updates, 304.117, 3.11.0-15-generic, x86_64: installed
   nvidia-304-updates, 304.117, 3.13.0-7-generic, x86_64: installed
   nvidia-304-updates, 304.117, 3.13.0-8-generic, x86_64: installed
  EcryptfsInUse: Yes
  GraphicsCard:
   NVIDIA Corporation G73 [GeForce 7600 GT] [10de:0391] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: BFG Tech Device [19f1:201f]
  JockeyStatus:
   kmod:nvidia_173 - NVIDIA legacy binary driver - version 173.14.39 (Proprietary, Disabled, Not in use)
   kmod:nvidia_304_updates - nvidia_304_updates (Proprietary, Enabled, Not in use)
   kmod:nvidia_304 - NVIDIA legacy binary driver - version 304.117 (Proprietary, Disabled, Not in use)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-8-generic root=UUID=cd444f9d-672e-4d7b-aea8-657fff0ea1f4 ro quiet splash crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M
  SourcePackage: unity
  UpgradeStatus: Upgraded to trusty on 2014-01-23 (26 days ago)
  dmi.bios.date: 06/26/2012
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: WBIBX10J.86A.0336.2012.0626.0141
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: DP55WB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAE64798-207
  dmi.chassis.type: 2
  dmi.modalias: dmi:bvnIntelCorp.:bvrWBIBX10J.86A.0336.2012.0626.0141:bd06/26/2012:svn:pn:pvr:rvnIntelCorporation:rnDP55WB:rvrAAE64798-207:cvn:ct2:cvr:
  drirc:
   <driconf>
   </driconf>
  version.compiz: compiz 1:0.9.11+14.04.20140217-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.0.1-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.0.1-1ubuntu2
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu2
  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: Tue Feb 18 10:57:01 2014
  xserver.configfile: /etc/X11/xorg.conf
  xserver.devices:
   input        Power Button         KEYBOARD, id 6
   input        Sleep Button         KEYBOARD, id 7
   input        Logitech Optical USB Mouse MOUSE, id 8
   input        BTC USB Multimedia Keyboard KEYBOARD, id 9
   input        BTC USB Multimedia Keyboard KEYBOARD, id 10
  xserver.errors:
   open /dev/dri/card0: No such file or directory
   open /dev/fb0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:

  xserver.version: 2:1.15.0-1ubuntu6

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