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apport information

** Attachment added: "ProcEnviron.txt"
   https://bugs.launchpad.net/bugs/1354841/+attachment/4262917/+files/ProcEnviron.txt

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https://bugs.launchpad.net/bugs/1354841

Title:
  Screen corruption (characters are drawn as black squares)

Status in “xorg” package in Ubuntu:
  Incomplete

Bug description:
  Sometimes, the characters are rendered as black squares (cf attachment). I couldn't find any event in the systems logs that could explain that.
  I can "stop" the bug by changing the anti-aliasing options in the system settings (enabled / disabled, level of hinting) and restarting the applications, but the squares can come back later on, and I have to repeat the operation.

  The bug almost exclusively happens with firefox and thunderbird,
  though krunner is also affected (but not other kde apps). I'm not
  using many GTK applications, but I can also see the bug with unison.

  It used to happen in 13.10 as well, and upgrading to 14.04.1 hasn't
  improved the situation

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Sun Aug 10 14:03:25 2014
  InstallationDate: Installed on 2011-01-10 (1307 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  ProcEnviron:
   LANGUAGE=
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to trusty on 2014-08-06 (3 days ago)
  --- 
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: kwin
  CurrentDesktop: KDE
  DistUpgraded: 2014-08-06 14:32:56,683 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroRelease: Ubuntu 14.04
  DistroVariant: kubuntu
  DkmsStatus:
   virtualbox, 4.3.10, 3.13.0-40-generic, x86_64: installed
   virtualbox-guest, 4.3.10, 3.13.0-40-generic, x86_64: installed
  ExtraDebuggingInterest: No
  GraphicsCard:
   Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:0428]
  InstallationDate: Installed on 2011-01-10 (1407 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  MachineType: Dell Inc. Latitude E5510
  Package: xorg 1:7.7+1ubuntu8
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-40-generic root=UUID=851d627f-547c-4a28-94e7-778e3a396d65 ro loop.max_part=63 quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
  Tags:  trusty kubuntu
  Uname: Linux 3.13.0-40-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-08-06 (103 days ago)
  UserGroups: adm admin audio cdrom condor dialout disk fuse lpadmin mysql plugdev sambashare video
  _MarkForUpload: True
  dmi.bios.date: 04/21/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A14
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA14:bd04/21/2013:svnDellInc.:pnLatitudeE5510:pvr0001:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E5510
  dmi.product.version: 0001
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.2
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.3
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Sat Nov 15 13:25:39 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               21579 
   vendor                                     SEC
  xserver.version: 2:1.15.1-0ubuntu2.2

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