Public bug reported:

Test case on a laptop:
With nvidia drivers installed, set prime profile of  Intel, reboot
Open nvidia settings to confirm it opens.
Let machine stand for 10 min. or so until screen blanks.
Wake up, unlock, then try to open nvidia-settings

What happens: nothing
>From terminal reports: 
$ nvidia-settings

ERROR: Unable to load info from any available system

Can not be opened until a reboot.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ubuntu-session 3.24.1-0ubuntu15
ProcVersionSignature: Ubuntu 4.11.0-10.15-generic 4.11.8
Uname: Linux 4.11.0-10-generic x86_64
ApportVersion: 2.20.5-0ubuntu5
Architecture: amd64
CurrentDesktop: GNOME
Date: Mon Jul 17 18:42:01 2017
InstallationDate: Installed on 2017-07-15 (1 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170708)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-session
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-session (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful wayland-session

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-session in Ubuntu.
https://bugs.launchpad.net/bugs/1704889

Title:
  After screen blanks (lockscreen) nvidia-settings can't open

Status in gnome-session package in Ubuntu:
  New

Bug description:
  Test case on a laptop:
  With nvidia drivers installed, set prime profile of  Intel, reboot
  Open nvidia settings to confirm it opens.
  Let machine stand for 10 min. or so until screen blanks.
  Wake up, unlock, then try to open nvidia-settings

  What happens: nothing
  From terminal reports: 
  $ nvidia-settings

  ERROR: Unable to load info from any available system

  Can not be opened until a reboot.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubuntu-session 3.24.1-0ubuntu15
  ProcVersionSignature: Ubuntu 4.11.0-10.15-generic 4.11.8
  Uname: Linux 4.11.0-10-generic x86_64
  ApportVersion: 2.20.5-0ubuntu5
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Mon Jul 17 18:42:01 2017
  InstallationDate: Installed on 2017-07-15 (1 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170708)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-session
  UpgradeStatus: No upgrade log present (probably fresh install)

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