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[Edit]
This bug has been around for a bit over a year now, and has gotten rather long, so this is a brief summary.
There is a memory corruption issue that affects users of the rs690m, to varying degrees.
For many most people, it makes the desktop unusable.

Workaround:   *Note: This is a workaround, not a fix.  It will give you a usable system.
[Natty]: Regression: This workaround now only provides 2d/software rendering, and one must either:
   * Choose choose the "Ubuntu Classic" session from the GDM Login screen
   or
   * Install the "unity-2d" package.  
  
[code]
sudo su
echo options radeon modeset=0 > /etc/modprobe.d/radeon-kms.conf
exit
[/code]
Note that this doesn't totally fix the issue, but brings your desktop to a workable state.

Freedesktop.org has dealt with one bug having to do with graphics corruption on the rs690m.  That bug has been fixed, but the issue of graphics corruption in general has not been resolved.  A new bug has been opened with freedesktop.org to continue pushing through the resolution of this issue.
[/edit]

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+3ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Uname: Linux 2.6.32-19-generic i686
Architecture: i386
Date: Tue Apr  6 12:58:29 2010
DkmsStatus: Error: [Errno 2] No such file or directory
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
MachineType: Gateway LT31
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.32-19-generic root=UUID=617a7a50-d35f-4b03-8bf1-f91ec024381b ro quiet splash
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: xorg
dmi.bios.date: 06/18/2009
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: v1.3201
dmi.board.name: SJM11-YK
dmi.board.vendor: Gateway
dmi.board.version: Not Applicable
dmi.chassis.type: 10
dmi.chassis.vendor: Gateway
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrv1.3201:bd06/18/2009:svnGateway:pnLT31:pvrNotApplicable:rvnGateway:rnSJM11-YK:rvrNotApplicable:cvnGateway:ct10:cvrN/A:
dmi.product.name: LT31
dmi.product.version: Not Applicable
dmi.sys.vendor: Gateway
system:
 distro:             Ubuntu
 codename:           lucid
 architecture:       i686
 kernel:             2.6.32-19-generic

[lspci]
01:05.0 VGA compatible controller [0300]: ATI Technologies Inc RS690M [Radeon X1200 Series] [1002:791f]
     Subsystem: Acer Incorporated [ALI] Device [1025:028c]

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

** Affects: xserver-xorg-driver-ati
     Importance: High
         Status: Fix Released


** Tags: apport-bug corruption i386 kernel-handoff-graphics lucd natty oneiric precise quantal
-- 
[rs690m] [Gateway] Graphics corruption with ati x1200
https://bugs.launchpad.net/bugs/556782
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