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[Grzegorz Cieslewski <grzegorz@xxxxxxxxx>]

I had simmilar issue.  I deisabled the gpu-manager.conf, deleted old
xorg.conf, used aticonfig --initial to create a new config file, logged
in and used amdcccle to make final adjustments.

I dont really understand this but it seems that there is some problem
with randr.

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https://bugs.launchpad.net/bugs/1311881

Title:
  dual screen ubuntu 14.04, second screen only partially displaying
  desktop

Status in “xorg” package in Ubuntu:
  Confirmed

Bug description:
  The second screen on my 2 monitor Ubuntu 14.04 setup is only partially showing any of the desktop.
  The primary screen is a 22" 1680*1050 and the secondary screen is 1920*1200.
  The primary screen has a complete and true 1680*1050 desktop, but the secondary screen only shows 1" of the 1920*1200 screen down the left vertical.
  The rest of the desktop is obscured under some "black window", with only the mouse being displayed as it travels through that screen.

  Any windows or items below that black area, can be interacted with,
  and the mouse indicates their presence with resize/minimise and other
  hints, but they do not display over the black area.

  The system was working perfectly fine in 13.10 and this issue only
  occurred after I upgraded to 14.04 and, faced with a "failed to start
  session" bug on the login screen, resorted to an "apt-get install
  ubuntu-desktop" to get my desktop up and running.

  My graphics card is an ATI Radeon HD 6670 and my monitors are Samsung
  Syncmaster 2232bw (22") and Dell UM2412M.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: fglrx
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Wed Apr 23 21:51:03 2014
  DistUpgraded: 2014-04-23 18:43:48,762 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Turks XT [Radeon HD 6670/7670] [1002:6758] (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:0443]
  InstallationDate: Installed on 2012-09-24 (576 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  MachineType: System manufacturer System Product Name
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=1aff935b-13e8-475e-a845-3d816a582db2 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to trusty on 2014-04-23 (0 days ago)
  dmi.bios.date: 03/23/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1103
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M5A78L-M/USB3
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1103:bd03/23/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM5A78L-M/USB3:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
  version.fglrx-installer: fglrx-installer N/A
  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: Wed Apr 23 22:38:29 2014
  xserver.configfile: default
  xserver.errors:
   open /dev/dri/card0: No such file or directory
   AIGLX error: failed to open /usr/X11R6/lib64/modules/dri/fglrx_dri.so, error[/usr/X11R6/lib64/modules/dri/fglrx_dri.so: cannot open shared object file: No such file or directory]
   AIGLX error: failed to open /usr/lib64/dri/fglrx_dri.so, error[/usr/lib64/dri/fglrx_dri.so: cannot open shared object file: No such file or directory]
   AIGLX error: failed to open /usr/X11R6/lib/modules/dri/fglrx_dri.so, error[/usr/X11R6/lib/modules/dri/fglrx_dri.so: cannot open shared object file: No such file or directory]
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.15.1-0ubuntu2
  xserver.video_driver: fglrx

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