Authentication error when the system gets suspended

Support and Help
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1

Ubuntu Version:
25.10

Desktop Environment (if applicable):
GNOME

Problem Description:
I am facing an issue where I am unable to log in to the system (Ubuntu 25.10, NVIDIA driver version 580.126.09) after it resumes from suspend. What makes this issue particularly strange is that it occurs only intermittently. Sometimes I am able to log in successfully, while at other times I am not. The behavior also appears to be independent of time. For example, I have successfully logged in to a suspended system after three hours, whereas on other occasions I failed to log in after less than an hour. Sometimes the motherboard itself becomes unresponsive (Caps lock and Numlock don’t turn on). So I’m not sure what’s going on. My system is up-to-date with the latest BIOS and other software.

Screenshots or Error Messages:

gnome-shell[3240]: Failed to open reauthentication channel: 
Gio.IOErrorEnum: Timeout was reached                                        
Stack trace:
  _promisify/proto[asyncFunc]/</<@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:454:45
  @resource:///org/gnome/shell/ui/init.js:21:20
  ### Promise created here: ###
  _openReauthenticationChannel@resource:///org/gnome/shell/gdm/util.js:692:53
  begin@resource:///org/gnome/shell/gdm/util.js:302:18
  begin@resource:///org/gnome/shell/gdm/authPrompt.js:921:28
  _onReset@resource:///org/gnome/shell/ui/unlockDialog.js:872:26
  reset@resource:///org/gnome/shell/gdm/authPrompt.js:897:14
  _ensureAuthPrompt@resource:///org/gnome/shell/ui/unlockDialog.js:780:30
  _showPrompt@resource:///org/gnome/shell/ui/unlockDialog.js:813:14
  vfunc_key_press_event@resource:///org/gnome/shell/ui/unlockDialog.js:700:14
  @resource:///org/gnome/shell/ui/init.js:21:20

What I’ve Tried:

  1. Disabling Wayland by uncommenting the line in /etc/gdm3/custom.conf.

  2. Added “nouveau.modeset=0” to GRUB_CMDLINE_LINUX (previous value is empty) in /etc/default/grub.

  3. Tried this as well which is quite unrelated to my error, but didn’t help.

  4. Few folks said it can be related to nvidia-driver, so I created a file in /etc/modprobe.d with below

options nvidia NVreg_PreserveVideoMemoryAllocations=1

…but nothing seems to work, and sometimes when I try to reboot from tty it doesn’t even shutdown properly. I need to force shutdown using the power button. Can anyone help me with the debugging this issue? I can attach a complete log in case you want to take a look.