Public bug reported:

Not sure if this is a gdm3 or nvidia-graphics issue.

Ubuntu 20.04, gdm3
Nvidia GTX 1650, Nvidia proprietary driver

After a fresh boot I can switch users from my X session with no problem in the 
first, say, 1 hour.
If I use the system for a day switching user takes me to a blank screen with 
only the mouse cursor for a few minutes until the logon screen does appear.

ssh'ing into my box while this happens shows Xorg at 100% cpu
utilisation and the following being appended to /var/log/Xorg.0.log (and
equiv in /var/log/syslog) at crazy speed:

[169729.637] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[169729.637] (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock
[169729.637] (--) NVIDIA(GPU-0): 
[169729.637] (--) NVIDIA(GPU-0): DFP-3: disconnected
[169729.637] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[169729.637] (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock
[169729.637] (--) NVIDIA(GPU-0): 
[169729.637] (--) NVIDIA(GPU-0): DFP-3: disconnected
[169729.637] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[169729.637] (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock
[169729.637] (--) NVIDIA(GPU-0): 
[169729.637] (--) NVIDIA(GPU-0): DFP-3: disconnected
[169729.637] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[169729.637] (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock
[169729.637] (--) NVIDIA(GPU-0): 
[169729.637] (--) NVIDIA(GPU-0): DFP-3: disconnected
[169729.637] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[169729.637] (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock
[169729.637] (--) NVIDIA(GPU-0): 
[169729.637] (--) NVIDIA(GPU-0): DFP-3: disconnected
[169729.637] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[169729.637] (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock
[169729.637] (--) NVIDIA(GPU-0): 
[169729.637] (--) NVIDIA(GPU-0): DFP-3: disconnected
[169729.637] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[169729.637] (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock
[169729.637] (--) NVIDIA(GPU-0): 
[169729.638] (--) NVIDIA(GPU-0): DFP-3: disconnected
[169729.638] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[169729.638] (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock
[169729.638] (--) NVIDIA(GPU-0): 
[169729.638] (--) NVIDIA(GPU-0): DFP-3: disconnected
[169729.638] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[169729.638] (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock

If I disconnect my monitor by pulling out the hdmi cable from the nvidia
card and reconnect it the logon screen comes up immediately and all is
good.

Otherwise I have to wait a few minutes and the logon screen will
eventually come up. The message in /var/log/Xorg.0.log I get after
unplugging is:

[169729.653] (--) NVIDIA(GPU-0): DFP-3: disconnected
[169729.653] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[169729.653] (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock
[169729.653] (--) NVIDIA(GPU-0): 
[169729.654] (II) systemd-logind: got resume for 13:69
[169729.655] (II) event5  - Logitech G102 Prodigy Gaming Mouse Consumer 
Control: is tagged by udev as: Keyboard
[169729.655] (II) event5  - Logitech G102 Prodigy Gaming Mouse Consumer 
Control: device is a keyboard
[169729.655] (II) systemd-logind: got resume for 13:70
[169729.656] (II) event6  - Logitech G102 Prodigy Gaming Mouse System Control: 
is tagged by udev as: Keyboard
[169729.656] (II) event6  - Logitech G102 Prodigy Gaming Mouse System Control: 
device is a keyboard
[169729.883] (--) NVIDIA(GPU-0): DFP-0: disconnected
[169729.883] (--) NVIDIA(GPU-0): DFP-0: Internal DisplayPort
[169729.883] (--) NVIDIA(GPU-0): DFP-0: 2660.0 MHz maximum pixel clock
[169729.883] (--) NVIDIA(GPU-0): 
[169729.883] (--) NVIDIA(GPU-0): DFP-1: disconnected
[169729.883] (--) NVIDIA(GPU-0): DFP-1: Internal TMDS
[169729.884] (--) NVIDIA(GPU-0): DFP-1: 165.0 MHz maximum pixel clock
[169729.884] (--) NVIDIA(GPU-0): 
[169729.884] (--) NVIDIA(GPU-0): DFP-2: disconnected
[169729.884] (--) NVIDIA(GPU-0): DFP-2: Internal TMDS
[169729.884] (--) NVIDIA(GPU-0): DFP-2: 165.0 MHz maximum pixel clock
[169729.884] (--) NVIDIA(GPU-0): 
[169729.986] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169729.986] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169729.986] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169729.986] (--) NVIDIA(GPU-0): 
[169730.400] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169730.400] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169730.400] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169730.400] (--) NVIDIA(GPU-0): 
[169730.430] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169730.430] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169730.430] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169730.430] (--) NVIDIA(GPU-0): 
[169734.634] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169734.634] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169734.634] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169734.634] (--) NVIDIA(GPU-0): 
[169734.696] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169734.696] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169734.696] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169734.696] (--) NVIDIA(GPU-0): 
[169735.228] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169735.228] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169735.228] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169735.228] (--) NVIDIA(GPU-0): 
[169735.258] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169735.258] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169735.258] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169735.258] (--) NVIDIA(GPU-0): 
[169769.503] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169769.503] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169769.503] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169769.503] (--) NVIDIA(GPU-0): 
[169769.563] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169769.563] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169769.563] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169769.563] (--) NVIDIA(GPU-0): 
[169770.007] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169770.007] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169770.007] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169770.007] (--) NVIDIA(GPU-0): 
[169770.039] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169770.039] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169770.039] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169770.039] (--) NVIDIA(GPU-0): 
[169787.703] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169787.703] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169787.703] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169787.703] (--) NVIDIA(GPU-0): 
[169787.762] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169787.762] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169787.762] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169787.762] (--) NVIDIA(GPU-0): 
[169788.206] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169788.206] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169788.206] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169788.206] (--) NVIDIA(GPU-0): 
[169788.235] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169788.235] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169788.235] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169788.235] (--) NVIDIA(GPU-0): 
[169805.753] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169805.753] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169805.753] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169805.753] (--) NVIDIA(GPU-0): 
[169805.814] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169805.814] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169805.814] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169805.814] (--) NVIDIA(GPU-0): 
[169806.348] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169806.348] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169806.348] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169806.348] (--) NVIDIA(GPU-0): 
[169806.378] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): connected
[169806.378] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): Internal TMDS
[169806.378] (--) NVIDIA(GPU-0): DELL U2518D (DFP-3): 600.0 MHz maximum pixel 
clock
[169806.378] (--) NVIDIA(GPU-0): 
[169813.565] (**) Option "fd" "44"
[169813.565] (II) event1  - Power Button: device removed
[169813.565] (**) Option "fd" "25"
[169813.565] (II) event0  - Power Button: device removed
[169813.566] (**) Option "fd" "47"
[169813.566] (II) event3  - Logitech G102 Prodigy Gaming Mouse: device removed
[169813.566] (**) Option "fd" "45"
[169813.566] (II) event4  - Logitech G102 Prodigy Gaming Mouse Keyboard: device 
removed
[169813.566] (**) Option "fd" "56"
[169813.566] (**) Option "fd" "46"
[169813.566] (II) event6  - Logitech G102 Prodigy Gaming Mouse System Control: 
device removed
[169813.567] (**) Option "fd" "26"
[169813.567] (II) event2  - AT Translated Set 2 keyboard: device removed
[169813.567] (**) Option "fd" "56"
[169813.567] (II) event5  - Logitech G102 Prodigy Gaming Mouse Consumer 
Control: device removed
[169813.687] (II) systemd-logind: got pause for 13:66
[169813.687] (II) systemd-logind: got pause for 13:67
[169813.687] (II) systemd-logind: got pause for 13:64
[169813.687] (II) systemd-logind: got pause for 13:65
[169813.687] (II) systemd-logind: got pause for 13:68
[169813.687] (II) systemd-logind: got pause for 13:69
[169813.687] (II) systemd-logind: got pause for 13:70

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xserver-xorg-video-nvidia-440 440.82+really.440.64-0ubuntu6
ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
Uname: Linux 5.4.0-28-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun May  3 11:35:39 2020
InstallationDate: Installed on 2020-04-24 (8 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: nvidia-graphics-drivers-440
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: nvidia-graphics-drivers-440 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1876565

Title:
  logon screen take minutes to appear after logging off or switching
  user once system has been running for a few days

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