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[bugbot <574449@xxxxxxxxxxxxxxxxxx>]

** Description changed:

  Ubuntu release: Ubuntu 10.04 LTS
  Edition: Desktop
  Architecture: i386
  
  Expected behaviour: Steady desktop with no flickering during entire
  session.
  
  Actual behaviour: -
  On the platform mentioned above, I experience random flickers on the desktop. The flickering does not occur frequently (time interval of several minutes or sometimes hours between two consecutive occurrences). The flickering has not caused any problems till now apart from the visual interference and it occurs at any time, not just when any particular windowed application is running. I could not find any means of forcing a flicker to reproduce the problem manually and since a flicker lasts only for a fraction of a second and is random, I cannot get a screenshot. From what glimpses I have been able to catch on one or two occasions, the flickers actually appear to be highly distorted snapshots of parts of currently or previously open windows stretching across the whole desktop for a fraction of a second and a few pixels high. However, because of the instantaneous disappearance, I am not sure that they are actually ghosts of windows. Sometimes it is so quick that all I can see is a line or a bar. Also, because of the nature of the problem, I cannot determine its source. It might be xorg, kernel (maybe KMS), GNOME, Metacity, Compiz, Nautilus or something else altogether. My hardware and relevant software specifications are provided below. I am booting with KMS enabled.
  Notes: -
  1. Searching the bug database, I only found bug #493707 somewhat similar but the two do not appear to be the same and there are no blue dots in my case.
  2. I have come back to Ubuntu with GNOME after skipping version 9.10 so I do not know whether this problem exists in 9.10.
  3. I have applied all updates that were available in lucid-security and lucid-updates in Software Sources, Updates.
  
  Computer: Dell Inspiron 1545 laptop
  CPU: Intel Core 2 Duo T6400 @ 2.0 GHz.
  RAM: 3 GB DDR2
  Hard disk: 320 GB 5400 RPM SATA
  Graphics subsystem: Integrated Intel GM45 Graphics
  Kernel: 2.6.32-21-generic (32-bit)
  Video driver: intel
  Swap space: 4.5 GB
  Desktop environment: GNOME with Compiz enabled (System, Preferences, Appearance, Visual Effects: Normal)
  --- 
  Architecture: i386
  CurrentDmesg:
   [   20.727072] ppdev: user-space parallel port driver
   [   21.689126] sky2 eth0: Link is up at 100 Mbps, full duplex, flow control both
   [   21.689324] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
   [   31.756049] eth0: no IPv6 routers present
  DistroRelease: Ubuntu 10.04
  DkmsStatus:
   bcmwl, 5.60.48.36+bdcom, 2.6.32-22-generic, i686: installed 
   bcmwl, 5.60.48.36+bdcom, 2.6.32-21-generic, i686: installed
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MachineType: Dell Inc. Inspiron 1545
  NonfreeKernelModules: wl
  Package: xorg 1:7.5+5ubuntu1
  PackageArchitecture: i386
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-22-generic root=UUID=42eac28e-5846-43c5-aaf2-9737d30fe1ed ro quiet splash
  ProcEnviron:
   LANG=en_IN
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
  Tags: lucid lucid
  Uname: Linux 2.6.32-22-generic i686
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 02/25/2009
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0J037P
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd02/25/2009:svnDellInc.:pnInspiron1545:pvr:rvnDellInc.:rn0J037P:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Inspiron 1545
  dmi.sys.vendor: Dell Inc.
  glxinfo: Error: [Errno 2] No such file or directory
  system:
   distro:             Ubuntu
   codename:           lucid
   architecture:       i686
   kernel:             2.6.32-22-generic
+ 
+ 
+ [lspci]
+ 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07)
+     	Subsystem: Dell Device [1028:02aa]

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https://bugs.launchpad.net/bugs/574449

Title:
  random flickers on ubuntu lucid desktop