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[Chris Halse Rogers <raof@xxxxxxxxxx>]

I think I've got a workaround locally, but I'd like to check that the
bug I'm working around locally is the same bug as here.  The gnome-
desktop3 packages in https://edge.launchpad.net/~raof/+archive/aubergine
contain a patch to wait 50msec during the modesetting to ensure that the
previous configuration changes have been applied before trying to apply
the new config.  For me, this seems to reliably work around problems
when disabling LVDS with an external display.

This is not a proper fix, but will point towards where to look in the
kernel for a proper fix.

Could you please test these packages (libgnome-desktop-3-2 version
3.2.0-0ubuntu4.2~raof1) and check whether you can reproduce this bug
with them?  You'll need to restart after installing the update, to
ensure that gnome-settings-daemon is using the right library.

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https://bugs.launchpad.net/bugs/861426

Title:
  [Oneiric] [Regression] When disabling onboard LVDS display and just
  using external VGA screen corruption occurs

Status in “gnome-desktop3” package in Ubuntu:
  Confirmed
Status in “gnome-desktop3” source package in Oneiric:
  Confirmed

Bug description:
  Lenovo T500

  00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
  00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)

  Will attach screenshot of what the display should look like, and one
  of the corruption.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: xorg 1:7.6+7ubuntu7
  ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 1.23-0ubuntu2
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,vpswitch,snap,resize,grid,imgpng,place,move,regex,mousepoll,wall,gnomecompat,session,unitymtgrabhandles,animation,fade,workarounds,expo,scale,ezoom,unityshell]
  CompositorRunning: compiz
  Date: Wed Sep 28 14:37:58 2011
  DistUpgraded: Log time: 2011-09-22 20:36:49.680898
  DistroCodename: oneiric
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
  GraphicsCard:
   Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:20e4]
     Subsystem: Lenovo Device [17aa:20e4]
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
  MachineType: LENOVO 2241B48
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.0.0-12-generic root=UUID=4587a2fe-b540-495f-ab91-999ee1b53a2a ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to oneiric on 2011-09-22 (5 days ago)
  dmi.bios.date: 04/22/2009
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6FET66WW (2.16 )
  dmi.board.name: 2241B48
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6FET66WW(2.16):bd04/22/2009:svnLENOVO:pn2241B48:pvrThinkPadT500:rvnLENOVO:rn2241B48:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2241B48
  dmi.product.version: ThinkPad T500
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.5.94+bzr20110919-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.26-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
  version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

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