Desktop background dosent show.

Desktop background dosent show and system performance is bad at screen resolution 1440x900. No problem at 1024x768

ProblemType: Bug
Architecture: i386
CheckboxCommand: xrandr_cycle
CheckboxDescription:
 Click Test to cycle through the detected video modes for your system.

 Did the screen appear to be working for each mode?
CheckboxTest: xrandr_cycle
Date: Sun Nov 1 14:11:26 2009
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
MachineType: Dell Computer Corporation OptiPlex GX260
Package: x11-xserver-utils 7.4+2ubuntu3
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-14-generic root=UUID=c3d1a356-7034-4986-9e2a-f805e4f934a8 ro quiet splash
ProcEnviron:
 SHELL=/bin/bash
 LANG=da_DK.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
RelatedPackageVersions:
 xserver-xorg 1:7.4+3ubuntu7
 libgl1-mesa-glx 7.6.0-1ubuntu4
 libdrm2 2.4.14-1ubuntu1
 xserver-xorg-video-intel 2:2.9.0-1ubuntu2
 xserver-xorg-video-ati 1:6.12.99+git20090929.7968e1fb-0ubuntu1
SourcePackage: x11-xserver-utils
Tags: checkbox-bug
Uname: Linux 2.6.31-14-generic i686
XorgConf: Error: [Errno 2] No such file or directory: '/etc/X11/xorg.conf'
dmi.bios.date: 04/28/2003
dmi.bios.vendor: Dell Computer Corporation
dmi.bios.version: A06
dmi.board.name: 02X378
dmi.board.vendor: Dell Computer Corp.
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Computer Corporation
dmi.modalias: dmi:bvnDellComputerCorporation:bvrA06:bd04/28/2003:svnDellComputerCorporation:pnOptiPlexGX260:pvr:rvnDellComputerCorp.:rn02X378:rvr:cvnDellComputerCorporation:ct6:cvr:
dmi.product.name: OptiPlex GX260
dmi.sys.vendor: Dell Computer Corporation
fglrx: Not loaded
system:
 distro: Ubuntu
 architecture: i686kernel: 2.6.31-14-generic