bug 808685 could be related which is fixed in trunk.

On Tue, Aug 2, 2011 at 3:42 PM, Ara Pulido <[email protected]> wrote:
> Moving back to new, as the reporter gave the needed information
>
> ** Changed in: unity (Ubuntu)
>       Status: Incomplete => New
>
> --
> You received this bug notification because you are subscribed to unity.
> https://bugs.launchpad.net/bugs/814721
>
> Title:
>  [Intel i915] Docking with external monitor often corrupts screen
>
> Status in Unity:
>  New
> Status in “unity” package in Ubuntu:
>  New
>
> Bug description:
>  Screenshot attached - generally after docking I experience the strange
>  garbled top-half of my screen on both heads untill I manage to run the
>  display manager, at which point either:
>
>  (a) things just start working as expected
>  (b) compiz/gnome-power-manage/some-other-critical-thing crashes or
>  (c) the screen goes mostly black with a ~1px border of flashing bright 
> colorful pixels on the left/top edges and the computer becomes unusable and I 
> have to hard-restart.
>
>  I *know* I've experienced this with the display-port connector on my
>  dock, and I *believe* it's happened via the built-in VGA on my X201,
>  but I haven't tried that since updating.
>
>  The 1px-border thing also happens often when resetting the display
>  properties some time after undocking.  That use case goes something
>  like this:
>
>   * Undock, walk to conference room
>   * realize I can't find windows that are on the "invisible" head that my 
> laptop still has configured.
>   * open display properties
>   * screen goes into the broken state with ~1px of colorful flashing pixels 
> and I have to restart.
>
>  This is also not consistently reproducible as far as I can tell.  It's
>  an expensive thing to experience and I haven't had time to try and
>  induce it.
>
>  This is on a recently-updated Ubuntu 11.04, with nothing custom wrt.
>  the OS/X (as far as I can recall).
>
>
>  I was directed to create this bug during discussions on the closed issue 
> here: https://bugs.launchpad.net/bugs/753971
>
>  The fix(es?) for #753971 did not resolve this problem.
>
>  ProblemType: Bug
>  DistroRelease: Ubuntu 11.04
>  Package: unity 3.8.16-0ubuntu1~natty1
>  ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
>  Uname: Linux 2.6.38-10-generic x86_64
>  Architecture: amd64
>  CompizPlugins: 
> [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,staticswitcher,resize,fade,unitymtgrabhandles,scale,session,unityshell]
>  CompositorRunning: compiz
>  Date: Fri Jul 22 09:46:48 2011
>  DistUpgraded: Fresh install
>  DistroCodename: natty
>  DistroVariant: ubuntu
>  DkmsStatus:
>   virtualbox-ose, 4.0.4, 2.6.38-10-generic, x86_64: installed
>   virtualbox-ose, 4.0.4, 2.6.38-8-generic, x86_64: installed
>  GraphicsCard:
>   Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] 
> (rev 02) (prog-if 00 [VGA controller])
>     Subsystem: Lenovo Device [17aa:215a]
>  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
>  InstallationMedia_: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
>  InstallationMedia__: Ubuntu 11.04 "Natty Narwhal" - Release amd64 
> (20110427.1)
>  Lsusb:
>   Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
>   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>   Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
>   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>  MachineType: LENOVO 3249CTO
>  ProcEnviron:
>   LANGUAGE=en_US:en
>   PATH=(custom, user)
>   LANG=en_US.UTF-8
>   SHELL=/bin/bash
>  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-10-generic 
> root=UUID=ce9fb930-bf9b-4295-aa25-da32aa65ac69 ro quiet splash vt.handoff=7
>  ProcVersionSignature_: Ubuntu 2.6.38-10.46-generic 2.6.38.7
>  ProcVersionSignature__: Ubuntu 2.6.38-10.46-generic 2.6.38.7
>  Renderer: Unknown
>  SourcePackage: unity
>  UpgradeStatus: No upgrade log present (probably fresh install)
>  dmi.bios.date: 06/07/2010
>  dmi.bios.vendor: LENOVO
>  dmi.bios.version: 6QET46WW (1.16 )
>  dmi.board.name: 3249CTO
>  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:bvr6QET46WW(1.16):bd06/07/2010:svnLENOVO:pn3249CTO:pvrThinkPadX201:rvnLENOVO:rn3249CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
>  dmi.product.name: 3249CTO
>  dmi.product.version: ThinkPad X201
>  dmi.sys.vendor: LENOVO
>  version.compiz: compiz 1:0.9.4+bzr20110606-0ubuntu1~natty2
>  version.ia32-libs: ia32-libs 20090808ubuntu13
>  version.libdrm2: libdrm2 2.4.23-1ubuntu6
>  version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu2
>  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
>  version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu2
>  version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3.1
>  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4.1
>  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
> 2:2.14.0-4ubuntu7.1
>  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
> 1:0.0.16+git20110107+b795ca6e-0ubuntu7
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/unity/+bug/814721/+subscriptions
>

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https://bugs.launchpad.net/bugs/814721

Title:
  [Intel i915] Docking with external monitor often corrupts screen

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