From eb53785634ca3e3dc9b4e967264b971030bc8629 Mon Sep 17 00:00:00 2001
From: Pratham Patel <prathampatel@thefossguy.com>
Date: Fri, 24 Apr 2026 13:26:29 +0530
Subject: [PATCH] nixos/cosmic-greeter: allow empty passwords

Auto-login masked part of this issue because the greeter was never
interacted with. But once the user's session gets locke, it never
unlocks because PAM doesn't allow empty passwords. This patch fixes that
behaviour.
---
 nixos/modules/services/display-managers/cosmic-greeter.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/services/display-managers/cosmic-greeter.nix b/nixos/modules/services/display-managers/cosmic-greeter.nix
index 93320b9be90a..c908ff3e3de1 100644
--- a/nixos/modules/services/display-managers/cosmic-greeter.nix
+++ b/nixos/modules/services/display-managers/cosmic-greeter.nix
@@ -73,7 +73,9 @@ in
       extraGroups = [ "video" ];
     };
     # Required for authentication
-    security.pam.services.cosmic-greeter = { };
+    security.pam.services.cosmic-greeter = {
+      allowNullPassword = true;
+    };
 
     hardware.graphics.enable = true;
     services.accounts-daemon.enable = true;