I see the same with:

kubuntu 17.10
Nvidia graphics (G84GL [Quadro FX 570])
Nouveau driver

When power management kicks in to switch off the screen via dpms, then
it is impossible to resume operation. As you move the mouse, there is no
screenlock screen to enter the password, just a black screen with the
mouse cursor.

All the relevant KDE/plasma processes are active, and so is the
screenlocker process.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/785681

Title:
  Unable to unblank screen, cursor still present

Status in xserver-xorg-video-intel package in Ubuntu:
  Incomplete
Status in Baltix:
  New

Bug description:
  Binary package hint: xserver-xorg-video-intel

  This is ~ev filing this bug on behalf of Ellen.  When her laptop
  blanked the screen, she tried to unlock it; however, it did not return
  from this state and only the mouse cursor was ever visible.  Switching
  to a VT showed that all the desktop processes were still running.
  Killing gnome-screensaver did not fix the issue, nor did running unity
  --reset.  This issue occurs  sporadically.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: xserver-xorg-video-intel 2:2.14.0-4ubuntu7.1
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  DRM.card0.DP.1:
   status: disconnected
   enabled: disabled
   dpms: Off
   modes: 
   edid-base64:
  DRM.card0.DP.2:
   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.LVDS.1:
   status: connected
   enabled: enabled
   dpms: On
   modes: 1366x768
   edid-base64: 
AP///////wBMo0FUAAAAAAATAQOQIhN4CsiVnldUkiYPUFQAAAABAQEBAQEBAQEBAQEBAQEBQRxWoFAAFjAwICUAWMIQAAAaQRxWoFAAFjAwICUAWMIQAAAaAAAA/gBTQU1TVU5HCiAgICAgAAAA/gBMVE4xNTZBVDAyUDA2AMQ=
  DRM.card0.VGA.1:
   status: disconnected
   enabled: disabled
   dpms: Off
   modes: 
   edid-base64:
  Date: Fri May 20 11:20:14 2011
  DistUpgraded: Log time: 2011-05-03 09:09:17.573737
  DistroCodename: natty
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller 
[8086:2a42] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:1862]
     Subsystem: ASUSTeK Computer Inc. Device [1043:1862]
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  MachineType: ASUSTeK Computer Inc. P50IJ
  ProcEnviron:
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic 
root=UUID=59f9e85c-7640-46a4-9844-626f6dd584e9 ro quiet splash vt.handoff=7
  Renderer: Unknown
  SourcePackage: xserver-xorg-video-intel
  UpgradeStatus: Upgraded to natty on 2011-05-03 (17 days ago)
  dmi.bios.date: 12/04/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 203
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: P50IJ
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr203:bd12/04/2009:svnASUSTeKComputerInc.:pnP50IJ:pvr1.0:rvnASUSTeKComputerInc.:rnP50IJ:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: P50IJ
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.
  version.compiz: compiz 1:0.9.4+bzr20110415-0ubuntu2
  version.ia32-libs: ia32-libs 20090808ubuntu13
  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

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