installation-cd-graphical-gnome: updates

Note we're not using wayland default in the graphical media because it
could cause headaches for Nvidia users. But the session is still available
if someone logs out.

1 files changed, 16 insertions, 5 deletions

diff --git a/nixos/modules/installer/cd-dvd/installation-cd-graphical-gnome.nix b/nixos/modules/installer/cd-dvd/installation-cd-graphical-gnome.nix
index 23c3426bff08..62cbdbcfd17b 100644
--- a/nixos/modules/installer/cd-dvd/installation-cd-graphical-gnome.nix
+++ b/nixos/modules/installer/cd-dvd/installation-cd-graphical-gnome.nix
@@ -1,5 +1,4 @@
-# This module defines a NixOS installation CD that contains X11 and
-# GNOME 3.
+# This module defines a NixOS installation CD that contains GNOME.
 
 { lib, ... }:
 
@@ -10,10 +9,22 @@ with lib;
 
   services.xserver.desktopManager.gnome3.enable = true;
 
-  # Auto-login as root.
-  services.xserver.displayManager.gdm.autoLogin = {
+  # Wayland can be problematic for some hardware like Nvidia graphics cards.
+  services.xserver.displayManager.defaultSession = "gnome-xorg";
+
+  services.xserver.displayManager.gdm = {
     enable = true;
-    user = "root";
+    # autoSuspend makes the machine automatically suspend after inactivity.
+    # It's possible someone could/try to ssh'd into the machine and obviously
+    # have issues because it's inactive.
+    # See:
+    # * https://github.com/NixOS/nixpkgs/pull/63790
+    # * https://gitlab.gnome.org/GNOME/gnome-control-center/issues/22
+    autoSuspend = false;
+    autoLogin = {
+      enable = true;
+      user = "nixos";
+    };
   };
 
 }