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[madbiologist <1313459@xxxxxxxxxxxxxxxxxx>]

Confirmed as per screenshot attached in comment #1.

** Changed in: xserver-xorg-video-ati (Ubuntu)
       Status: Incomplete => New

** Changed in: xserver-xorg-video-ati (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1313459

Title:
  Screen corruption with Radeon 6670

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

Bug description:
  Unfortunately I have no reliable way of reproducing this issue, but it
  seems that after some time of using Ubuntu (especially when browsing
  websites with firefox) the graphics are getting corrupted.

  It starts with some small artifacts (single lines and pixels) and all
  of the sudden the entire screen is full of artifacts and the OS is
  basically unusable at this state.

  Coincidentally, I've had this problem with Arch Linux before. I was able to fix it, by setting the power profile of the GPU to "mid" or "high" as described here: https://wiki.archlinux.org/index.php/ATI#Profile-based_frequency_switching
  So to me it seems like this might be related to power management.

  Doing some more testing with Ubuntu, I was able to fix the corruption
  when switching the profile to mid and then logging out and in again.
  Leaving the profile at default did not fix the issue after re-login.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.1-0ubuntu3
  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
  CurrentDmesg:
   [   16.420258] init: plymouth-upstart-bridge main process ended, respawning
   [   42.046534] audit_printk_skb: 123 callbacks suppressed
   [   42.046536] type=1400 audit(1398637834.876:68): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=2158 comm="apparmor_parser"
   [   42.046541] type=1400 audit(1398637834.876:69): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=2158 comm="apparmor_parser"
   [   42.046831] type=1400 audit(1398637834.876:70): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=2158 comm="apparmor_parser"
  Date: Mon Apr 28 00:32:39 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Turks XT [Radeon HD 6670/7670] [1002:6758] (prog-if 00 [VGA controller])
     Subsystem: PC Partner Limited / Sapphire Technology Device [174b:e198]
  InstallationDate: Installed on 2014-04-27 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=71941913-ad5f-4bba-8378-81cbf78bd8d2 ro quiet splash vt.handoff=7
  SourcePackage: xserver-xorg-video-ati
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/24/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: FA
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z77-D3H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrFA:bd07/24/2013:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ77-D3H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
  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
  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: Mon Apr 28 00:30:08 2014
  xserver.configfile: default
  xserver.devices:
   input        Power Button         KEYBOARD, id 6
   input        Power Button         KEYBOARD, id 7
   input        Logitech USB-PS/2 Optical Mouse MOUSE, id 8
   input        AT Translated Set 2 keyboard KEYBOARD, id 9
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.15.1-0ubuntu2
  xserver.video_driver: radeon

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