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[jerrylamos <jerrylamos@xxxxxxxxxxxx>]

Yes, this is Acer Aspire 1 D255E Intel Atom N455

Alt-Tab freezes saucy beta 2 3.11.0-11 instantly on first Alt-Tab.
Switching windows with cursor no problem at all if a corner of the
window is visible.

So far adding 
MESA_GL_VERSION_OVERRIDE=1.4
to /etc/environment seems to work.

Thanks for your suggestion.

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https://bugs.launchpad.net/bugs/1233932

Title:
  Saucy Beta 2 Alt-Tab desktop froze

Status in “unity” package in Ubuntu:
  Incomplete

Bug description:
  Firefox up, did Alt-Tab to switch to a different window.  Desktop
  froze.  Would not respond to cursor or anything.

  Ctrl-Alt-F1 and then did
  ubuntu-bug unity

  which can't start a launcher because desktop still frozen.

  Did K to write report to /tmp

  Ctrl-Alt-F7 to desktop which was still screwed up.
  Waited.......finally woke up, then used file manager to select the
  /tmp/apport.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: unity 7.1.1+13.10.20130927.1-0ubuntu1
  ProcVersionSignature: Ubuntu 3.11.0-9.16-generic 3.11.2
  Uname: Linux 3.11.0-9-generic x86_64
  ApportVersion: 2.12.5-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  Date: Tue Oct  1 21:53:02 2013
  DistUpgraded: Fresh install
  DistroCodename: saucy
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx Integrated Graphics Controller [8086:a011] (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] Device [1025:0349]
     Subsystem: Acer Incorporated [ALI] Device [1025:0349]
  InstallationDate: Installed on 2013-09-28 (3 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Beta amd64 (20130925.1)
  MachineType: Acer AOD255E
  MarkForUpload: True
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-9-generic root=UUID=cc14937c-d48f-48fa-8777-b50adfef3800 ro quiet splash vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/16/2010
  dmi.bios.vendor: Acer
  dmi.bios.version: V3.12(DDR3)
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: JE02_PT
  dmi.board.vendor: Acer
  dmi.board.version: V3.12(DDR3)
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V3.12(DDR3)
  dmi.modalias: dmi:bvnAcer:bvrV3.12(DDR3):bd12/16/2010:svnAcer:pnAOD255E:pvrV3.12(DDR3):rvnAcer:rnJE02_PT:rvrV3.12(DDR3):cvnAcer:ct10:cvrV3.12(DDR3):
  dmi.product.name: AOD255E
  dmi.product.version: V3.12(DDR3)
  dmi.sys.vendor: Acer
  version.compiz: compiz 1:0.9.10+13.10.20130927.1-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.46-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.2-1ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.2-1ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.14.2.901-2ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu9
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.14-4ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
  xserver.bootTime: Tue Oct  1 21:21:37 2013
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               25042 
   vendor                                     AUO
  xserver.version: 2:1.14.2.901-2ubuntu7

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