On an updated Ubuntu 13.04 if I wait more than ~20 seconds before tray to unlock the screen stays completely black and the system require an hardware reboot. If I unlock the screen before the ~20 seconds are expired everything works perfectly.
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: xorg 1:7.7+1ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
.tmp.unity.support.test.0:
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Sat Apr 27 09:12:33 2013
DistUpgraded: 2013-04-26 12:30:09,085 DEBUG enabling apt cron job
DistroCodename: raring
DistroVariant: ubuntu
GraphicsCard:
Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Dell Device [1028:0569]
InstallationDate: Installed on 2012-12-10 (137 days ago)
InstallationMedia: Ubuntu GNOME Remix 12.10 "Quantal Quetzal" - Release amd64(20121023)
MachineType: Dell Inc. Inspiron 5520
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic root=UUID=0f01392f-542e-4a05-930c-c659e2a9f6a6 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to raring on 2013-04-26 (0 days ago)
dmi.bios.date: 10/03/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A11
dmi.board.name: 04G65K
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A11
dmi.modalias: dmi:bvnDellInc.:bvrA11:bd10/03/2012:svnDellInc.:pnInspiron5520:pvrA11:rvnDellInc.:rn04G65K:rvrA00:cvnDellInc.:ct8:cvrA11:
dmi.product.name: Inspiron 5520
dmi.product.version: A11
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.9~daily13.04.18.1~13.04-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.43-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.1.1-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.1.1-0ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.6-0ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.7-0ubuntu1
Status changed to 'Confirmed' because the bug affects multiple users.