Public bug reported:

Switching users causes the login screen to lock up and the mouse and
keyboard to become unresponsive.

The order is this:
1) I select "switch user..." from the top bar
2) the login screen pops up and displays the list of users
2) I select my user
4) I enter the password
5) the screen turns black for 2-3 seconds (this is much longer than usual)
6) the login screen pops up again, this time with the text "password" in the 
input box; the gear in the bottom right corner to select the type of session is 
missing; the mouse and keyboard are unresponsive
7) I need to reboot

I have tried disabling Wayland (uncommented WaylandEnable=false in
/etc/gdm3/custom.conf) but that does not make any difference.

I do not know whether this may be related, but I have had to disabled
the nvidia systemd services because my system failed to suspend until I
did (nvidia driver 470).

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: gdm3 41~rc-0ubuntu2
ProcVersionSignature: Ubuntu 5.13.0-22.22-generic 5.13.19
Uname: Linux 5.13.0-22-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu71
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sun Dec 12 12:11:57 2021
InstallationDate: Installed on 2021-10-12 (61 days ago)
InstallationMedia: Ubuntu 21.10 "Impish Indri" - Beta amd64 (20210922)
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gdm3 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug impish third-party-packages

** Description changed:

- Switching users cause the login screen to lock up and the mouse and
+ Switching users causes the login screen to lock up and the mouse and
  keyboard to become unresponsive.
  
  The order is this:
- 1) I select "switch user..." from the top bar 
+ 1) I select "switch user..." from the top bar
  2) gdm3 pops up and displays the list of users
  2) I select my user
- 4) I enter the password 
- 5) the screen turns black for 2-3 seconds (this is much longer than usual) 
+ 4) I enter the password
+ 5) the screen turns black for 2-3 seconds (this is much longer than usual)
  6) the login screen pops up again, this time with the text "password" in the 
password input box; at this stage, the mouse and keyboard have become 
unresponsive
  7) I need to reboot
  
  I have tried disabling Wayland (uncommented WaylandEnable=false in
  /etc/gdm3/custom.conf) but that does not make any difference.
  
  I do not know whether this may be related, but I have had to disabled
  the nvidia systemd services because my system failed to suspend until I
  did (nvidia driver 470).
  
  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: gdm3 41~rc-0ubuntu2
  ProcVersionSignature: Ubuntu 5.13.0-22.22-generic 5.13.19
  Uname: Linux 5.13.0-22-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu71
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Dec 12 12:11:57 2021
  InstallationDate: Installed on 2021-10-12 (61 days ago)
  InstallationMedia: Ubuntu 21.10 "Impish Indri" - Beta amd64 (20210922)
  SourcePackage: gdm3
  UpgradeStatus: No upgrade log present (probably fresh install)

** Description changed:

  Switching users causes the login screen to lock up and the mouse and
  keyboard to become unresponsive.
  
  The order is this:
  1) I select "switch user..." from the top bar
- 2) gdm3 pops up and displays the list of users
+ 2) the login screen pops up and displays the list of users
  2) I select my user
  4) I enter the password
  5) the screen turns black for 2-3 seconds (this is much longer than usual)
- 6) the login screen pops up again, this time with the text "password" in the 
password input box; at this stage, the mouse and keyboard have become 
unresponsive
+ 6) the login screen pops up again, this time with the text "password" in the 
input box; the gear in the bottom right corner to select the type of session is 
missing; the mouse and keyboard are unresponsive
  7) I need to reboot
  
  I have tried disabling Wayland (uncommented WaylandEnable=false in
  /etc/gdm3/custom.conf) but that does not make any difference.
  
  I do not know whether this may be related, but I have had to disabled
  the nvidia systemd services because my system failed to suspend until I
  did (nvidia driver 470).
  
  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: gdm3 41~rc-0ubuntu2
  ProcVersionSignature: Ubuntu 5.13.0-22.22-generic 5.13.19
  Uname: Linux 5.13.0-22-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu71
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Dec 12 12:11:57 2021
  InstallationDate: Installed on 2021-10-12 (61 days ago)
  InstallationMedia: Ubuntu 21.10 "Impish Indri" - Beta amd64 (20210922)
  SourcePackage: gdm3
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1954586

Title:
  login screen freezes when switching users

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