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Public bug reported:

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)

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug kubuntu resolution trusty

** Attachment added: "Example of screen corruption"
   https://bugs.launchpad.net/bugs/1354841/+attachment/4173843/+files/black_squares.png

** Package changed: xorg (Ubuntu) => ubuntu

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

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

Status in Ubuntu:
  New

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)

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