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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Fikrul Arif, thank you for reporting this and helping make Ubuntu better. Raring reached EOL on January 27, 2014.
See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases

Is this an issue on a supported release?

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1272242

Title:
  Hybrid graphics: switching to discrete by using switcheroo make screen
  going black

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  How to reproduce:
  * In lightdm login screen, switch to tty2 (Ctrl+Alt+F2)
  * Execute this after login:

      sudo su
      service lightdm stop
      echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch
      # frozen here, can't switch to other ttys; but keyboard input is still received, eg.:
      reboot

  Actually I want to switch to AMD Radeon graphics, because in X session
  it would not work.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: xorg 1:7.7+1ubuntu4
  ProcVersionSignature: Ubuntu 3.8.0-35.50-generic 3.8.13.13
  Uname: Linux 3.8.0-35-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.9.2-0ubuntu8.5
  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
  Date: Fri Jan 24 16:28:48 2014
  DistUpgraded: 2013-05-13 10:19:43,316 DEBUG enabling apt cron job
  DistroCodename: raring
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:183a]
   Advanced Micro Devices [AMD] nee ATI Thames XT [Radeon HD 7670M] [1002:6840] (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:183a]
  InstallationDate: Installed on 2012-11-04 (445 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: Hewlett-Packard HP Pavilion g4 Notebook PC
  MarkForUpload: True
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-35-generic root=UUID=e04f70eb-7ce2-4634-a927-dd1049671407 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to raring on 2013-05-13 (256 days ago)
  dmi.bios.date: 01/18/2012
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.01
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 183A
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 56.0E
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnHewlett-Packard:bvrF.01:bd01/18/2012:svnHewlett-Packard:pnHPPaviliong4NotebookPC:pvr0791100000205610000620100:rvnHewlett-Packard:rn183A:rvr56.0E:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP Pavilion g4 Notebook PC
  dmi.product.version: 0791100000205610000620100
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.9~daily13.06.19~13.04-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu36
  version.libdrm2: libdrm2 2.4.46-1ubuntu0.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.1.7-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.1.7-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu6.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.6-0ubuntu4.3
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.7-0ubuntu1
  xserver.bootTime: Fri Jan 24 16:14:57 2014
  xserver.configfile: default
  xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.13.3-0ubuntu6.2
  xserver.video_driver: intel

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