Public bug reported:

After upgrading to Oneiric I'm experiencing the following bug:
When executing "xset dpms force off" I can't get the monitor back again by 
using mouse or hitting a key. It remains black and I have to do a restart.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: x11-xserver-utils 7.6+3
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,place,session,regex,mousepoll,snap,grid,animation,compiztoolbox,vpswitch,gnomecompat,resize,imgpng,wall,move,workarounds,fade,expo,unitymtgrabhandles,ezoom,scale,unityshell]
CompositorRunning: compiz
Date: Wed Oct 19 19:24:35 2011
DistUpgraded: Log time: 2011-10-18 17:05:55.677638
DistroCodename: oneiric
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] 
(rev 18) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:046e]
 nVidia Corporation Device [10de:0df1] (rev ff) (prog-if ff)
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
MachineType: Dell Inc. XPS L501X
ProcEnviron:
 PATH=(custom, user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic 
root=UUID=673671dc-55a3-4a11-bf24-f739eb211d5d ro quiet splash 
acpi_backlight=vendor vt.handoff=7
SourcePackage: x11-xserver-utils
UdevDb: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
UpgradeStatus: Upgraded to oneiric on 2011-10-18 (1 days ago)
dmi.bios.date: 03/29/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 00CKNG
dmi.board.vendor: Dell Inc.
dmi.board.version: A07
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A07
dmi.modalias: 
dmi:bvnDellInc.:bvrA07:bd03/29/2011:svnDellInc.:pnXPSL501X:pvrA07:rvnDellInc.:rn00CKNG:rvrA07:cvnDellInc.:ct8:cvrA07:
dmi.product.name: XPS L501X
dmi.product.version: A07
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu5
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
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110411+8378443-1

** Affects: gnome-power-manager (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: x11-xserver-utils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 needs-reassignment oneiric 
regression-update running-unity ubuntu

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https://bugs.launchpad.net/bugs/878363

Title:
  "xset dpms force off": Screen doesn't come back

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