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[Maurizio <iciocunicio@xxxxxxxxx>]

This bug is still present on 15.04

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https://bugs.launchpad.net/bugs/1342675

Title:
  Random characters in screen text suddenly disappear

Status in xserver-xorg-video-intel package in Ubuntu:
  Fix Committed

Bug description:
  While using my machine, characters suddenly disappear. No character in
  particular, not in any single application in particular, and copying
  and pasting the text preserves the characters.

  Scrolling the text out of view and back into view doesn't affect the
  missing characters. Switching between applications may change the
  affected characters (possibly due to a redraw operation?)

  Restarting often solves the problem, but it comes back after a couple
  of hours working. I've attached a screenshot to show you the problem.

  I do believe this is different than the bug relating to garbled characters in a number of ways
  1. I don't ever get garbled characters
  2. Scrolling out/in of the affected text doesn't re-show the missing characters, even navigating inside the application has no effect. 3. It's global, I can even see it on Desktop icon names

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Wed Jul 16 14:48:25 2014
  DistUpgraded: 2014-06-29 16:38:35,552 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 4.3.10, 3.11.0-24-generic, x86_64: installed
   virtualbox, 4.3.10, 3.13.0-30-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])
     Subsystem: LG Electronics, Inc. Device [1854:0803]
  InstallationDate: Installed on 2014-03-28 (109 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: LG Electronics R590-G.ARIBE8
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic root=UUID=79c2f2b5-87cb-44d0-83fa-d99e73bb0a73 ro quiet splash vt.handoff=7
  SourcePackage: xserver-xorg-video-intel
  UpgradeStatus: Upgraded to trusty on 2014-06-29 (16 days ago)
  dmi.bios.date: 01/06/2010
  dmi.bios.vendor: INSYDE
  dmi.bios.version: QL4L3I51
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Base Board Product Name
  dmi.board.vendor: Intel Corp.
  dmi.board.version: Base Board Version
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 1
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnINSYDE:bvrQL4L3I51:bd01/06/2010:svnLGElectronics:pnR590-G.ARIBE8:pvr05:rvnIntelCorp.:rnBaseBoardProductName:rvrBaseBoardVersion:cvnChassisManufacturer:ct1:cvrChassisVersion:
  dmi.product.name: R590-G.ARIBE8
  dmi.product.version: 05
  dmi.sys.vendor: LG Electronics
  version.compiz: compiz 1:0.9.11.1+14.04.20140701-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  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
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Wed Jul 16 01:52:06 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                 560 
   vendor                                     LGD
  xserver.version: 2:1.15.1-0ubuntu2

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