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[David Pérez <1098334@xxxxxxxxxxxxxxxxxx>]

I've found a relevant document about our bug:

There are a couple of backends available for accelerating the DDX. "UXA"
(Unified Acceleration Architecture) is the mature backend that was
introduced to support the GEM driver model. It is in the process of
being superseded by "SNA" (Sandybridge's New Acceleration). Until that
process is complete, the ability to choose which backend to use remains
for backwards compatibility.

SNA is the default acceleration method in xf86-video-intel. If you are experience issues with SNA (e.g. pixelated graphics, corrupt text, etc.), try using UXA instead, which can be done by creating an X configuration file containing the following:
/etc/X11/xorg.conf.d/20-intel.conf
Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   Option      "AccelMethod"  "uxa"
EndSection

Source: https://wiki.archlinux.org/index.php/Intel_graphics#SNA_issues

So, I've created a file called 60-patch-graphis.conf in the
/usr/share/X11/xorg.conf.d folder, and reboot my system.  I let you know
about the results....

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https://bugs.launchpad.net/bugs/1098334

Title:
  [gen4 sna] Font corruption

Status in xf86-video-intel:
  In Progress
Status in xserver-xorg-video-intel package in Ubuntu:
  Fix Released

Bug description:
  After enabling the SNA acceleration method and rebooting, I noticed
  that graphical glitches appeared in the letters on Chromium's tab bar
  during the mouse hover animation. I've attached a screenshot
  illustrating this, particularly with the letter "g" in the screenshot.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: xorg 1:7.7+1ubuntu4
  ProcVersionSignature: Ubuntu 3.7.0-7.15-generic 3.7.0
  Uname: Linux 3.7.0-7-generic x86_64
  ApportVersion: 2.8-0ubuntu1
  Architecture: amd64
  Date: Thu Jan 10 16:00:55 2013
  InstallationDate: Installed on 2012-09-24 (107 days ago)
  InstallationMedia: Kubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120822.2)
  MarkForUpload: True
  SourcePackage: xorg
  UpgradeStatus: Upgraded to raring on 2012-09-25 (107 days ago)

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