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[Maarten Jacobs <782726@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Binary package hint: xorg

After upgrading from 10.10 Maverick to 11.04 Natty I found that my dual-
head display configuration on 10.10 no longer worked properly on 11.04.

My desired set-up is to have two 1440x900 monitors set up side-by-side
and the desktop stretched across the both of them.

It took me some time to figure out the right configuration on 10.10, but
I got it to work so I was less than enthused about it not working on
11.04.

I documented a question on this issue here:

https://answers.launchpad.net/ubuntu/+question/157414/+index

I have attached a screenshot of my side-by-side configuration - as is
clear the larger portion of the display is not shown right.

After some digging, I found that a "above-and-below" configuration did
work without the presentation being garbled. I'll try to attach a
screenshot of that situation as well (after I've submitted the bug as it
would appear it's not possible to attach multiple files??)

Then, at the end of the day (literally) I stumbled upon a reference to
issues with compiz - so I decided to try and log onto Ubuntu using
"Ubuntu Classic (No Effects)". If I understand correctly, this option
will force the system to run Metacity (??) window manager. After I did
this, the side-by-side configuration worked without garbling.

I therefore have a perfectly acceptable work-around for this problem
(i.e. don't use compiz), and I've not lost anything in my transition
from 10.10 to 11.04 (other than a days worth of digging to find the
work-around).

However I felt that it is probably appropriate to open a bug on this. As
i indicated above, the problem went away once i stopped using compiz -
so I think that's where the problem is but I've not been able to
ascertain that (in other words the problem may be lower down somewhere).

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: xorg 1:7.6+4ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-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
DRM.card0.VGA.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1440x900 1280x1024 1280x1024 1440x900 1280x960 1152x864 1024x768 1024x768 1024x768 832x624 800x600 800x600 800x600 800x600 640x480 640x480 640x480 640x480 720x400
 edid-base64: AP///////wAWCQYZtQIAACYRAQNoKRp4KoX1plhHmSQSUFS/74CBgHFPgUCVD5UAAQEBAQEBmimg0FGEIjBQmDYAmgERAAAcAAAA/wBLMTY3OUNBMDAwNjkzAAAA/QAyTB5TDgAKICAgICAgAAAA/ABIMTlXCiAgICAgICAgAH4=
Date: Sat May 14 12:50:36 2011
DistUpgraded: Log time: 2011-05-11 19:19:10.034707
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard:
 ATI Technologies Inc RV280 [Radeon 9200] [1002:5961] (rev 01) (prog-if 00 [VGA controller])
   Subsystem: PC Partner Limited Sapphire Radeon 9200 [174b:7c13]
   Subsystem: PC Partner Limited Sapphire Radeon 9200 [174b:7c12]
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
MachineType: ASUSTeK Computer INC. A7N8X-X
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=018f5979-3444-4290-8b62-a02af3685786 ro quiet splash radeon.modeset=1 vt.handoff=7
Renderer: Unknown
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to natty on 2011-05-12 (2 days ago)
dmi.bios.date: 08/19/2003
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: ASUS A7N8X-X ACPI BIOS Rev 1006
dmi.board.name: A7N8X-X
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: REV 2.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufactture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvrASUSA7N8X-XACPIBIOSRev1006:bd08/19/2003:svnASUSTeKComputerINC.:pnA7N8X-X:pvrREV2.xx:rvnASUSTeKComputerINC.:rnA7N8X-X:rvrREV2.xx:cvnChassisManufactture:ct3:cvrChassisVersion:
dmi.product.name: A7N8X-X
dmi.product.version: REV 2.xx
dmi.sys.vendor: ASUSTeK Computer INC.
version.compiz: compiz 1:0.9.4+bzr20110415-0ubuntu2
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
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
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

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug compiz-0.9 corruption i386 natty regression-update ubuntu

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https://bugs.launchpad.net/bugs/782726

Title:
  Dual-Head Configuration does not work properly with Compiz