Desktop screen becomes corrupted randomly after upgrade to 11.04

[rajeevthegreat]

Binary package hint: xorg

Ever since I have upgraded to 11.04, at random interval desktop screen becomes corrupted. This never happened with previous releases. I have not seen any pattern about when this problem happens, and thus I do not know how it could be reproduced. The only way to correct this issue is restart of desktop, but if you are in middle of some important work, this restart may not be feasible.

I have attached screen shot of my corrupted desktop.

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,imgjpeg,decor,snap,expo,resize,place,session,compiztoolbox,regex,vpswitch,scale,gnomecompat,move,mousepoll,grid,workarounds,titleinfo,imgpng,unitymtgrabhandles,ezoom,staticswitcher,thumbnail]
CompositorRunning: None
Date: Sun May 29 12:16:10 2011
DistUpgraded: Log time: 2011-04-29 21:19:08.007717
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard:
 ATI Technologies Inc M22 [Mobility Radeon X300] [1002:5460] (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:2002]
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: Dell Inc. Inspiron 9300
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
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=c5495a6c-2b2a-4783-b774-2c94a0a46940 ro nomodeset quiet vga=795 crashkernel=384M-2G:64M,2G-:128M splash vt.handoff=7
Renderer: Software
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to natty on 2011-04-30 (29 days ago)
dmi.bios.date: 09/19/2005
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A05
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA05:bd09/19/2005:svnDellInc.:pnInspiron9300:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Inspiron 9300
dmi.sys.vendor: Dell 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

[rajeevthegreat (rajeev-misra)]

This problem again happened today. I have attached the screenshot.

[Bryce Harrington (bryce)]

Hey rajeev-misra,

You filed this bug report against natty, but I see it's still open and
doesn't appear to have much activity recently. So, now that oneiric
is released and stable, this may be a good point for you to upgrade
and re-test if this issue is still present there.

If it's solved in the new release and you think it's worth backporting
the fix, please indicate that. Or if having the fix in the new release
is good enough, feel free to close out the bug (or let us know and we'll
close it.)

If it's not solved, leave the bug report open. I can't promise we'll
get to it (we get way more bugs filed than we can usually get to), but
your testing and feedback can help out if and when we do.

[bugbot (bugbot)]

We're closing this bug since it is has been some time with no response from the original reporter. However, if the issue still exists please feel free to reopen with the requested information. Also, if you could, please test against the latest development version of Ubuntu, since this confirms the bug is one we may be able to pass upstream for help.

[David Oxland (doxland)]

I suspect this bug may affect me. Same machine
Corruption of screen is only occasional.
with horizontal lines of black upside down reversed text which is usually from header bar.
Also Unity task bar is affected.