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[Bug 1350747] [NEW] Black screen after lock or switch user

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Public bug reported:

This started about a week ago, I started getting very frequent problems
with lockscreen and switching users. After using either of them never
brings the system back. Most of the time I just get a black screen
(sometimes with mouse cursor).

The system seems to respond to keyboard but the display is broken. I
have no clue whether it's xorg, lightdm or anything else.

This never happened until a few days ago.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic i686
.tmp.unity.support.test.0:
 
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: i386
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Thu Jul 31 10:42:04 2014
DistUpgraded: 2014-04-23 18:05:29,040 DEBUG enabling apt cron job
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 4.3.10, 3.13.0-27-generic, i686: installed
 virtualbox, 4.3.10, 3.13.0-29-generic, i686: installed
 virtualbox, 4.3.10, 3.13.0-30-generic, i686: installed
 virtualbox, 4.3.10, 3.13.0-31-generic, i686: installed
 virtualbox, 4.3.10, 3.13.0-32-generic, i686: installed
ExtraDebuggingInterest: Yes
GpuHangFrequency: Several times a day
GpuHangReproducibility: Occurs more often under certain circumstances
GpuHangStarted: Within the last few days
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] RV730/M96-XT [Mobility Radeon HD 4670] [1002:9488] (prog-if 00 [VGA controller])
   Subsystem: Apple Inc. Device [106b:00b6]
InstallationDate: Installed on 2011-10-06 (1028 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110921.2)
MachineType: Apple Inc. iMac10,1
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=61478576-72d6-40c8-81d0-3bf6629cc397 ro quiet splash reboot=pci vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to trusty on 2014-04-23 (98 days ago)
dmi.bios.date: 09/03/09
dmi.bios.vendor: Apple Inc.
dmi.bios.version: IM101.88Z.00CC.B00.0909031926
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Mac-F2268DC8
dmi.board.vendor: Apple Inc.
dmi.chassis.asset.tag: Asset Tag#
dmi.chassis.type: 13
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-F2268DC8
dmi.modalias: dmi:bvnAppleInc.:bvrIM101.88Z.00CC.B00.0909031926:bd09/03/09:svnAppleInc.:pniMac10,1:pvr1.0:rvnAppleInc.:rnMac-F2268DC8:rvr:cvnAppleInc.:ct13:cvrMac-F2268DC8:
dmi.product.name: iMac10,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.1
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Thu Jul 31 10:23:05 2014
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.15.1-0ubuntu2.1
xserver.video_driver: radeon

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug compiz-0.9 freeze i386 trusty ubuntu

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1350747

Title:
  Black screen after lock or switch user

Status in “xorg” package in Ubuntu:
  New

Bug description:
  This started about a week ago, I started getting very frequent
  problems with lockscreen and switching users. After using either of
  them never brings the system back. Most of the time I just get a black
  screen (sometimes with mouse cursor).

  The system seems to respond to keyboard but the display is broken. I
  have no clue whether it's xorg, lightdm or anything else.

  This never happened until a few days ago.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic i686
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: i386
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Thu Jul 31 10:42:04 2014
  DistUpgraded: 2014-04-23 18:05:29,040 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 4.3.10, 3.13.0-27-generic, i686: installed
   virtualbox, 4.3.10, 3.13.0-29-generic, i686: installed
   virtualbox, 4.3.10, 3.13.0-30-generic, i686: installed
   virtualbox, 4.3.10, 3.13.0-31-generic, i686: installed
   virtualbox, 4.3.10, 3.13.0-32-generic, i686: installed
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: Several times a day
  GpuHangReproducibility: Occurs more often under certain circumstances
  GpuHangStarted: Within the last few days
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] RV730/M96-XT [Mobility Radeon HD 4670] [1002:9488] (prog-if 00 [VGA controller])
     Subsystem: Apple Inc. Device [106b:00b6]
  InstallationDate: Installed on 2011-10-06 (1028 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110921.2)
  MachineType: Apple Inc. iMac10,1
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=61478576-72d6-40c8-81d0-3bf6629cc397 ro quiet splash reboot=pci vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: Upgraded to trusty on 2014-04-23 (98 days ago)
  dmi.bios.date: 09/03/09
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: IM101.88Z.00CC.B00.0909031926
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Mac-F2268DC8
  dmi.board.vendor: Apple Inc.
  dmi.chassis.asset.tag: Asset Tag#
  dmi.chassis.type: 13
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F2268DC8
  dmi.modalias: dmi:bvnAppleInc.:bvrIM101.88Z.00CC.B00.0909031926:bd09/03/09:svnAppleInc.:pniMac10,1:pvr1.0:rvnAppleInc.:rnMac-F2268DC8:rvr:cvnAppleInc.:ct13:cvrMac-F2268DC8:
  dmi.product.name: iMac10,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Thu Jul 31 10:23:05 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.15.1-0ubuntu2.1
  xserver.video_driver: radeon

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