For using desktop/gnome/work, work-around for me is using :

prime-select intel

This turns off nVidia and is OK for non-3d-intensive usage.

I can turn nVidia back on for gaming - and interestingly, there is no
freezing during game-play.

I also confirm that dragging links in Chrome _usually_ activates this
"nvlock" issue.

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to nvidia-graphics-drivers-418 in Ubuntu.

  nvLock: client timed out, taking the lock

Status in nvidia-graphics-drivers-418 package in Ubuntu:

Bug description:
  While launching an app or performing an operation, the screen has a
  certain chance to freeze for a few seconds and then recover.

  [ System Info ]
  Version : Ubuntu 19.04
  Kernel : x86_64 Linux 5.0.0-13-generic
  GPU : NVIDIA GeForce GTX 1050
  Xorg version : 1:7.7+19ubuntu12
  Product Name : Aspire VX5-591G (Acer)

  [ Log File ]
  Uploaded as an attachment

  *Sorry for my not-good English.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: xorg 1:7.7+19ubuntu12
  ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
  Uname: Linux 5.0.0-13-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] 是一个目录: 
  .proc.driver.nvidia.registry: Binary: ""
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  418.56  Fri Mar 15 12:59:26 
CDT 2019
   GCC version:  gcc version 8.3.0 (Ubuntu 8.3.0-6ubuntu1)
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
  BootLog: Error: [Errno 13] 权限不够: '/var/log/boot.log'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Apr 20 17:19:29 2019
  DistUpgraded: Fresh install
  DistroCodename: disco
  DistroVariant: ubuntu
   nvidia, 418.56, 5.0.0-13-generic, x86_64: installed
   virtualbox, 6.0.6, 4.18.0-17-generic, x86_64: installed
   virtualbox, 6.0.6, 5.0.0-13-generic, x86_64: installed
  ExtraDebuggingInterest: I just need to know a workaround
   Intel Corporation HD Graphics 630 [8086:591b] (rev 04) (prog-if 00 [VGA 
     Subsystem: Acer Incorporated [ALI] HD Graphics 630 [1025:1127]
     Subsystem: Acer Incorporated [ALI] GP107M [GeForce GTX 1050 Mobile] 
  MachineType: Acer Aspire VX5-591G
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-13-generic 
root=UUID=a0525f6e-8c28-4e08-9c6e-9745ee51c18a ro quiet splash vt.handoff=1
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install) 07/07/2017
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V1.06
  dmi.board.asset.tag: Type2 - Board Serial Number Wish_KLS
  dmi.board.vendor: KBL
  dmi.board.version: V1.06
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.06
dmi:bvnInsydeCorp.:bvrV1.06:bd07/07/2017:svnAcer:pnAspireVX5-591G:pvrV1.06:rvnKBL:rnWish_KLS:rvrV1.06:cvnAcer:ct10:cvrV1.06: Aspire VX 15 Aspire VX5-591G
  dmi.product.sku: 0000000000000000
  dmi.product.version: V1.06
  dmi.sys.vendor: Acer
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.97-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.2-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.4-1ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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