Xorg freeze with Ubuntu Floating Ubuntu Screensaver when Power Managment set to put display to sleep

Binary package hint: gnome-screensaver

While using the Classic Ubuntu Desktop with effects, I've experienced Xorg freezes when returning to my desktop after the screen has gone blank.

If I move my mouse or hit the keyboard, the Floating Ubuntu screensaver will come back up but it is frozen, with no animations.

I can move the mouse and, as I've enabled CTRL-ALT-Backspace, I can restart X.

The problem DOES NOT appear to happen when using the screensaver by itself. After looking through my power management settings, it looks like the problem is partially related to the Power Management being set to put the display to sleep after a set period of time.

I've changed the power management setting to NEVER put the display to sleep and have thus far not had the same problem any more.

So, to my untrained eye, it looks like there may be some bad reactions between power management and the screensaver.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: xorg 1:7.6+4ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
DRM.card0.DP.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes:
 edid-base64:
DRM.card0.HDMI.A.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes:
 edid-base64:
DRM.card0.VGA.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1280x1024 1280x1024 1024x768 1024x768 800x600 800x600 640x480 640x480 720x400
 edid-base64: AP///////wAe+c8GaRUAACUNAQNoIhx46PWWo1hNliQZUlalSwCBgAEBAQEBAQEBAQEBAQEBAAAA/gogICAgICAgICAgICAgAAAA/gogICAgICAgICAgICAgAAAA/QA4Sx5TDgAKICAgICAgAAAA/ABGUEQxNzMwCiAgICAgAK8=
Date: Tue May 17 08:21:08 2011
DistUpgraded: Log time: 2011-05-12 08:53:43.945019
DistroCodename: natty
DistroVariant: ubuntu
DkmsStatus:
 virtualbox-ose, 4.0.4, 2.6.35-28-generic, i686: installed
 virtualbox-ose, 4.0.4, 2.6.38-8-generic, i686: installed
GraphicsCard:
 Intel Corporation 4 Series Chipset Integrated Graphics Controller [8086:2e12] (rev 03) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:027f]
   Subsystem: Dell Device [1028:027f]
MachineType: Dell Inc. OptiPlex 760
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: root=UUID=8c35a362-1995-4d36-9edc-98de7612b66c ro quiet splash
Renderer: Unknown
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to natty on 2011-05-12 (4 days ago)
dmi.bios.date: 04/29/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A03
dmi.board.name: 0M858N
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA03:bd04/29/2009:svnDellInc.:pnOptiPlex760:pvr:rvnDellInc.:rn0M858N:rvrA01:cvnDellInc.:ct6:cvr:
dmi.product.name: OptiPlex 760
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.4+bzr20110415-0ubuntu2
version.libdrm2: libdrm2 2.4.23-1ubuntu6
version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu2
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu7