Public bug reported:

When I'm scrolling in eg. emacs/gnome-terminal the screen is not always
fully updated. Parts of the window keep displaying what was there before
I scrolled. It happens frequently but I have not found a reproducible
way to trigger it. I marked it as regression because it didn't happen in
11.04

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xserver-xorg 1:7.6+7ubuntu6
ProcVersionSignature: Ubuntu 3.0.0-10.16-generic 3.0.4
Uname: Linux 3.0.0-10-generic i686
Architecture: i386
CurrentDmesg:
 [   40.093031] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
 [   51.888018] eth0: no IPv6 routers present
 [   64.120275] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro,commit=0
Date: Fri Sep  9 09:42:41 2011
DistroCodename: oneiric
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation 82Q35 Express Integrated Graphics Controller [8086:29b2] 
(rev 02) (prog-if 00 [VGA controller])
   Subsystem: Dell OptiPlex 755 [1028:0211]
   Subsystem: Dell OptiPlex 755 [1028:0211]
MachineType: Dell Inc. OptiPlex 755
ProcKernelCmdLine: root=UUID=6425420f-b762-4e4c-8e72-9f298c4d3df6 ro quiet 
splash vga=795
SourcePackage: xorg
UpgradeStatus: Upgraded to oneiric on 2011-09-08 (0 days ago)
XorgConf: Error: [Errno 13] Permission denied: '/etc/X11/xorg.conf'
dmi.bios.date: 11/05/2007
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0GM819
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA04:bd11/05/2007:svnDellInc.:pnOptiPlex755:pvr:rvnDellInc.:rn0GM819:rvr:cvnDellInc.:ct6:cvr:
dmi.product.name: OptiPlex 755
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.5.92+bzr2791-0ubuntu2
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
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 
1:6.14.99~git20110811.g93fc084-0ubuntu1
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

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


** Tags: apport-bug i386 oneiric regression ubuntu

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https://bugs.launchpad.net/bugs/845429

Title:
  parts of the screen are not always updated

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