Public bug reported:

After locking screen and as a result the monitor going into sleep mode,
I can't get the login screen anymore, the monitor stays in sleep mode
forever.

In previous Ubuntu versions after pressing any key or the mouse, the
login screen showed up, but not anymore. I have to do a
Ctrl+Alt+Backspace

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.10.0-27.30~16.04.2-generic 4.10.17
Uname: Linux 4.10.0-27-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
BootLog: /dev/sdc5: clean, 307593/23363584 files, 5157711/93435648 blocks
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: Wed Jul 26 11:47:17 2017
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 NVIDIA Corporation GK107GL [Quadro K2000] [10de:0ffe] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: Hewlett-Packard Company GK107GL [Quadro K2000] [103c:094c]
InstallationDate: Installed on 2017-07-17 (8 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
MachineType: Hewlett-Packard HP Z620 Workstation
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-27-generic 
root=UUID=5db25c2a-88a7-429c-9a7d-445e7694f7d6 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/01/2013
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: J61 v03.18
dmi.board.asset.tag: 2UA33318D4
dmi.board.name: 158A
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 0.00
dmi.chassis.asset.tag: 2UA33318D4
dmi.chassis.type: 6
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrJ61v03.18:bd07/01/2013:svnHewlett-Packard:pnHPZ620Workstation:pvr:rvnHewlett-Packard:rn158A:rvr0.00:cvnHewlett-Packard:ct6:cvr:
dmi.product.name: HP Z620 Workstation
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.70-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.6-0ubuntu0.16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.6-0ubuntu0.16.04.1
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Wed Jul 26 11:43:34 2017
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input        USB CAT5             KEYBOARD, id 8
 input        USB CAT5             MOUSE, id 9
 input        HP WMI hotkeys       KEYBOARD, id 10
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.4-1ubuntu6.1~16.04.2
xserver.video_driver: nouveau

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


** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial

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https://bugs.launchpad.net/bugs/1706702

Title:
  Can't login after lock screen (black screen)

Status in xorg package in Ubuntu:
  New

Bug description:
  After locking screen and as a result the monitor going into sleep
  mode, I can't get the login screen anymore, the monitor stays in sleep
  mode forever.

  In previous Ubuntu versions after pressing any key or the mouse, the
  login screen showed up, but not anymore. I have to do a
  Ctrl+Alt+Backspace

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.10.0-27.30~16.04.2-generic 4.10.17
  Uname: Linux 4.10.0-27-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  BootLog: /dev/sdc5: clean, 307593/23363584 files, 5157711/93435648 blocks
  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: Wed Jul 26 11:47:17 2017
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   NVIDIA Corporation GK107GL [Quadro K2000] [10de:0ffe] (rev a1) (prog-if 00 
[VGA controller])
     Subsystem: Hewlett-Packard Company GK107GL [Quadro K2000] [103c:094c]
  InstallationDate: Installed on 2017-07-17 (8 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
  MachineType: Hewlett-Packard HP Z620 Workstation
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-27-generic 
root=UUID=5db25c2a-88a7-429c-9a7d-445e7694f7d6 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/01/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: J61 v03.18
  dmi.board.asset.tag: 2UA33318D4
  dmi.board.name: 158A
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 0.00
  dmi.chassis.asset.tag: 2UA33318D4
  dmi.chassis.type: 6
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvrJ61v03.18:bd07/01/2013:svnHewlett-Packard:pnHPZ620Workstation:pvr:rvnHewlett-Packard:rn158A:rvr0.00:cvnHewlett-Packard:ct6:cvr:
  dmi.product.name: HP Z620 Workstation
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.70-1~ubuntu16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.6-0ubuntu0.16.04.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.6-0ubuntu0.16.04.1
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Wed Jul 26 11:43:34 2017
  xserver.configfile: default
  xserver.devices:
   input        Power Button         KEYBOARD, id 6
   input        Power Button         KEYBOARD, id 7
   input        USB CAT5             KEYBOARD, id 8
   input        USB CAT5             MOUSE, id 9
   input        HP WMI hotkeys       KEYBOARD, id 10
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.4-1ubuntu6.1~16.04.2
  xserver.video_driver: nouveau

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