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[David Barth <david.barth@xxxxxxxxxxxxx>]

Could that be related to:
https://bugs.launchpad.net/ubuntu/+source/nux/+bug/764044 ?

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https://bugs.launchpad.net/bugs/824099

Title:
  Max GL texture size can break multi-head

Status in Unity:
  Invalid
Status in “compiz” package in Ubuntu:
  Invalid
Status in “gnome-desktop3” package in Ubuntu:
  Fix Released
Status in “unity” package in Ubuntu:
  Triaged
Status in “compiz” source package in Oneiric:
  Won't Fix
Status in “gnome-desktop3” source package in Oneiric:
  Fix Released
Status in “unity” source package in Oneiric:
  Won't Fix
Status in “compiz” source package in p-series:
  Triaged
Status in “gnome-desktop3” source package in p-series:
  Confirmed
Status in “unity” source package in p-series:
  Triaged

Bug description:
  There's a longstanding issue (see the duplicate bug #555641) with
  Compiz and multi-monitor setups with any combined dimension larger
  than the maximum GL texture size.  It used to be the case that this
  would simply crash compiz, but mesa now has code to fallback to
  software rendering for those cases.  Unfortunately, this rendering is
  unacceptably slow (on the order of 10s of seconds per frame),
  particularly since the only hardware that will realistically hit this
  limit is netbook hardware with the associated anaemic CPU.  It also
  appears to be broken in some cases (see bug #830949), although I can't
  reproduce that myself.

  The Compiz "Copy to Texture" plugin can break textures up into <= max
  texture size chunks, allowing hardware rendering to work with these
  large framebuffers.  This is insufficient for Unity, though, which
  also needs a way to break up its FBOs.

  For Oneiric we should patch g-s-d's xrandr plugin to disallow setting
  a multi-monitor configuration with any dimension >= max texture size
  when Unity is running.  Additionally, the display capplet should not
  allow a resolution to be explicitly set that will break Unity.  For P
  this should be dropped in favour of enabling Compiz's "Copy to
  Texture" plugin and fixing Unity.

  String Freeze Exception Request:
  This patch adds a new failure mode and explanatory error message to gnome-desktop's randr handling.  This new message is required to explain to the user why their multi-head setup request has been rejected, and what can be done about it.

  Original report:
  THIS IS A MASTER BUG OF FOUR DIFFERENT BUGS:

  [nVidia] https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/830955
  [Intel N10] https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/830949
  [Intel Arrandale, Mobile 4 Series] https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/830952
  [ATI] https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/830953

  Oneiric Alpha 3 installed on this system.  Under testing, one test is
  to plug in an external monitor and ensure that external video
  functions properly.  On this EeePC, it does not.  (See photo attached
  to this bug).

  Once the external montior is plugged in, both the primary display and
  the external display are horribly garbled.  The only thing that exists
  on the screen that's remotely readable is the panel at the top.  The
  rest of the desktop area is just a mess.

  Affected systems and GPUs:

  Dell Vostro 1014 (Intel Mobile 4 Series)
  Dell Vostro 1015 (Intel Mobile 4 Series)
  Lenovo Thinkpad Edge 11 (Intel Arrandale)
  Lenovo Thinkpad Edge 14 (M92 [Mobility Radeon HD 4500/5100 Series])
  Lenovo Thinkpad Edge 15 (Intel Arrandale)
  Lenovo Thinkpad SL410 (Intel Mobile 4 Series)
  Lenovo Thinkpad Edge 15 (ATI Technologies Inc M880G [Mobility Radeon HD 4200])
  Lenovo Thinkpad L412 (Intel Arrandale)
  Lenovo Thinkpad Edge 11 (ATI Technologies Inc: M880G [Mobility Radeon HD 4200])
  Dell Vostro 1520 (Intel Mobile 4 Series)
  Dell Vostro 1720 (Intel Mobile 4 Series)
  Dell Studio XPS 1340 (nVidia Corporation: GT218 [GeForce G210M])
  Dell Inspiron 1545 (Intel Mobile 4 Series)
  Dell Studio XPS 1340 (nVidia Corporation: G98 [GeForce 9200M GS])
  Dell Vostro 3300 (Intel Arrandale)
  Dell Vostro 3500 (Intel Arrandale)
  Dell Vostro 3700 (Intel Arrandale)
  Dell Precision M4500 (nVidia Corporation: GT215 [Quadro FX 1800M])
  Dell Latitude E6410 (nVidia Corporation: GT218 [NVS 3100M])
  Toshiba Tecra A11/M11 (Intel Arrendale)
  Toshiba Tecra S11/M11 (nVidia Corporation: GT218 [NVS 2100M])
  Dell Latitude 2110 (Intel Corporation: N10 Family Integrated Graphics Controller)
  Dell Latitude 13 (Intel Mobile 4 Series)
  Dell Vostro 3400 (Intel Arrandale)
  Dell Vostro V13 (Intel Mobile 4 Series)
  Dell Vostro 3500 (Intel Arrandale)
  Dell Vostro V13 (Intel Mobile 4 Series)
  Dell Vostro 3700 (Intel Arrandale)
  Dell Precision M6500 (ATI Technologies Inc: M97 GL [ATI FirePro M7740])
  Toshiba Tecra R700 (Intel Arrandale)
  Dell Inspiron 15R (Intel Arrandale)
  HP ProBook 6550b (Intel Arrandale)
  Asus EeePC 1001PXD (Intel Corporation: N10 Family Integrated Graphics Controller)
  Asus EeePC 1011PX (Intel Corporation: N10 Family Integrated Graphics Controller)
  Asus EeePC 1015PX (Intel Corporation: N10 Family Integrated Graphics Controller)
  Dell Mini 10 (Intel Corporation: N10 Family Integrated Graphics Controller)

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: xorg 1:7.6+7ubuntu6
  ProcVersionSignature: Ubuntu 3.0.0-8.10-generic 3.0.1
  Uname: Linux 3.0.0-8-generic i686
  Architecture: i386
  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: Wed Aug 10 13:38:33 2011
  DistUpgraded: Fresh install
  DistroCodename: oneiric
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
  GraphicsCard:
   Intel Corporation N10 Family Integrated Graphics Controller [8086:a011] (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:83ac]
     Subsystem: ASUSTeK Computer Inc. Device [1043:83ac]
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110803.1)
  LightdmGreeterLog:

  MachineType: ASUSTeK Computer INC. 1001PXD
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-8-generic root=UUID=bbe0cd86-364f-4ba4-9c7d-7f9b165d66c1 ro quiet splash initcall_debug vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/12/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0105
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: 1001PXD
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: x.xx
  dmi.chassis.asset.tag: 0x00000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer INC.
  dmi.chassis.version: x.x
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0105:bd08/12/2010:svnASUSTeKComputerINC.:pn1001PXD:pvrx.x:rvnASUSTeKComputerINC.:rn1001PXD:rvrx.xx:cvnASUSTeKComputerINC.:ct10:cvrx.x:
  dmi.product.name: 1001PXD
  dmi.product.version: x.x
  dmi.sys.vendor: ASUSTeK Computer INC.
  version.compiz: compiz 1:0.9.5.0-0ubuntu2
  version.libdrm2: libdrm2 2.4.26-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu2
  version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.2-1ubuntu2
  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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