I am running the default 20.04 gnome desktop, except for the display
manager.

I'm not sure how to trigger the issue since the problem is that the
screensaver doesn't start when it's supposed to.

Ran

     journalctl -b 0

Checked the journal nothing there related to gnome. There are a lot of
network entries.

     xset -display :0.0 dpms force off

will turn the display off ctrl-c will turn it back on.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-screensaver in Ubuntu.
https://bugs.launchpad.net/bugs/1905982

Title:
  Screen not Blanking after upgrade to 20.04

Status in gnome-screensaver package in Ubuntu:
  Incomplete

Bug description:
  After a do-release-upgrade from 18.04 to 20.04 screen blanking stopped 
working.
  I had my desktop set to blank but no lock the screen.
  After the upgrtade it does not ever blank. 

   preferences are set in Settings-> Power -> Blank Screen 10 minutes
   Automatic Suspend is OFF

   gnome-screensaver is running

   gnome-screensaver command -a doesn't do anything.

   video driver is Nvidia-455

   Display Manager is lightdm switching to gdm3 causes the video to not
  work properly.

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https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1905982/+subscriptions

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