Comment 3 for bug 915408

Forwarding this bug from Ubuntu reporter Joe Barnett:
http://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/915408

[Problem]
i have an external monitor (1920x1200 resolution) that, when set to 1920x1080 resolution (native resolution of laptop display), garbles the screen as seen in the screenshot below. The problem doesn't happen using the catalyst driver.

https://bugs.launchpad.net/lightdm-gtk-greeter/+bug/813566/+attachment/2221015/+files/2011-07-20_07-51-28_83.jpg

ProblemType: BugDistroRelease: Ubuntu 11.10
Package: xorg 1:7.6+7ubuntu7
ProcVersionSignature: Ubuntu 3.0.0-15.25-generic 3.0.13
Uname: Linux 3.0.0-15-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 1.23-0ubuntu4
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,staticswitcher,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: None
Date: Thu Jan 12 07:42:25 2012
DistUpgraded: Log time: 2011-07-13 10:07:59.371965
DistroCodename: oneiric
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
ATI Technologies Inc Broadway PRO [Mobility Radeon HD 5800 Series] [1002:68a1] (prog-if 00 [VGA controller])
Subsystem: Hewlett-Packard Company Device [103c:1522]InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Release Candidate amd64 (20100419.1)
MachineType: Hewlett-Packard HP ENVY 15 Notebook PC
ProcEnviron:
PATH=(custom, user)
LANG=en_US.UTF-8ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-15-generic root=UUID=639dc488-e095-42a4-8c1f-ffb1a9299e1c ro crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7SourcePackage: xorg
UpgradeStatus: Upgraded to oneiric on 2011-07-13 (182 days ago)
dmi.bios.date: 04/23/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.26
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 1522
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 36.34
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnHewlett-Packard:bvrF.26:bd04/23/2010:svnHewlett-Packard:pnHPENVY15NotebookPC:pvr048F110000241920001530000:rvnHewlett-Packard:rn1522:rvr36.34:cvnHewlett-Packard:ct10:cvrN/A:
dmi.product.name: HP ENVY 15 Notebook PC
dmi.product.version: 048F110000241920001530000
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu6
version.ia32-libs: ia32-libs 20090808ubuntu26
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+7ubuntu7
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 2:2.15.901-1ubuntu2.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1