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[Furkan Alaca <falaca@xxxxxxxxx>]

Just some further testing: The checkerboarding doesn't occur when the
screens are aligned at the top (in other words, when y=0 for both
monitors in .config/monitors.xml)

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https://bugs.launchpad.net/bugs/1440602

Title:
  Graphics corruption after suspend/resume cycle

Status in xserver-xorg-video-ati package in Ubuntu:
  Confirmed

Bug description:
  I have observed two forms of graphics corruption after a
  suspend/resume cycle:

  1) Checkerboard artifacts in approximately the top 1/8 to 1/4 of the
  screen. This can be observed from the following video, where I am
  highlighting global menu entries with the mouse:
  https://www.dropbox.com/s/ez2v03oetppecgx/VID_20150324_020612.mp4?dl=0

  A similar effect can also be observed while dragging windows around
  near the top of the screen.

  2) The virtual terminals no longer take up the full screen area, and
  are surrounded by a pattern which appears similar to noise or "snow"
  on old TVs. Here's how it appears on my screen:
  https://www.dropbox.com/s/7hj8qi3w3qc35jb/IMG_20150405_155434.jpg?dl=0

  While these two issues seem quite unrelated, they both seem to happen
  _only_ after a suspend/resume cycle, so the underlying issue might be
  related between them.

  Relevant hardware details:
  -Video card: Radeon R7 260X (w/ the radeonsi driver)
  -Main display resolution: 2560x1440 
  -Secondary display resolution: 1200x1920 (portrait mode)

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-11.11-generic 3.19.3
  Uname: Linux 3.19.0-11-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.17-0ubuntu1
  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: Sun Apr  5 16:00:07 2015
  DistUpgraded: 2015-03-27 18:17:09,531 DEBUG enabling apt cron job
  DistroCodename: vivid
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Bonaire XTX [Radeon R7 260X] [1002:6658] (prog-if 00 [VGA controller])
     Subsystem: VISIONTEK Device [1545:7260]
  InstallationDate: Installed on 2014-06-06 (302 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Gigabyte Technology Co., Ltd. GA-970A-D3
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-11-generic root=UUID=d254b01f-2bf2-4b57-acdc-c796786f4c4c ro
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to vivid on 2015-03-27 (8 days ago)
  dmi.bios.date: 12/16/2013
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F13b
  dmi.board.name: GA-970A-D3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF13b:bd12/16/2013:svnGigabyteTechnologyCo.,Ltd.:pnGA-970A-D3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-970A-D3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-970A-D3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  version.compiz: compiz 1:0.9.12.1+15.04.20150330-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.59-0ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2build1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
  xserver.bootTime: Sun Apr  5 17:47:11 2015
  xserver.configfile: default
  xserver.errors:
   evdev: Microsoft Natural® Ergonomic Keyboard 4000: Unable to open evdev device "/dev/input/event4".
   evdev: Microsoft Natural® Ergonomic Keyboard 4000: Unable to open evdev device "/dev/input/event5".
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.1-0ubuntu3
  xserver.video_driver: radeon

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