Bug 28941

Forwarding this bug from Ubuntu reporter :
http://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/586217

[Problem]
the screen got to be black and came back again immediately. After this, all the windows behave strangely. I click the icon of the current window on the panel, the window minimized with visible diminishing window border. It is not smooth animation.

DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic x86_64
Architecture: amd64
Date: Thu May 27 15:46:58 2010
DkmsStatus: Error: [Errno 2] No such file or directory
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
MachineType: Hewlett-Packard HP Compaq 6515b (KS256PA#AB2)
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.32-22-generic root=UUID=82d6adf2-5354-49b0-bc79-863fd5b2b294 ro quiet splash
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.utf8SourcePackage: xorg
Symptom: display
dmi.bios.date: 03/04/2008
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68YTT Ver. F.0B
dmi.board.name: 30C2
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 71.2D
dmi.chassis.asset.tag: CNU83100N3
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68YTTVer.F.0B:bd03/04/2008:svnHewlett-Packard:pnHPCompaq6515b(KS256PA#AB2):pvrF.0B:rvnHewlett-Packard:rn30C2:rvrKBCVersion71.2D:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP Compaq 6515b (KS256PA#AB2)
dmi.product.version: F.0B
dmi.sys.vendor: Hewlett-Packard
system: codename:           lucid
 architecture:       x86_64
 kernel:             2.6.32-22-generic