1 files changed, 41 insertions, 6 deletions
diff --git a/nixos/modules/services/x11/display-managers/sddm.nix b/nixos/modules/services/x11/display-managers/sddm.nix
index ae947a5d2d4..6b344822977 100644
--- a/nixos/modules/services/x11/display-managers/sddm.nix
+++ b/nixos/modules/services/x11/display-managers/sddm.nix
@@ -17,6 +17,16 @@ let
     exec ${dmcfg.xserverBin} ${dmcfg.xserverArgs} "$@"
   '';
 
+  Xsetup = pkgs.writeScript "Xsetup" ''
+    #!/bin/sh
+    ${cfg.setupScript}
+  '';
+
+  Xstop = pkgs.writeScript "Xstop" ''
+    #!/bin/sh
+    ${cfg.stopScript}
+  '';
+
   cfgFile = pkgs.writeText "sddm.conf" ''
     [General]
     HaltCommand=${pkgs.systemd}/bin/systemctl poweroff
@@ -39,6 +49,8 @@ let
     SessionCommand=${dmcfg.session.script}
     SessionDir=${dmcfg.session.desktops}
     XauthPath=${pkgs.xorg.xauth}/bin/xauth
+    DisplayCommand=${Xsetup}
+    DisplayStopCommand=${Xstop}
 
     ${optionalString cfg.autoLogin.enable ''
     [Autologin]
@@ -98,6 +110,27 @@ in
         '';
       };
 
+      setupScript = mkOption {
+        type = types.str;
+        default = "";
+        example = ''
+          # workaround for using NVIDIA Optimus without Bumblebee
+          xrandr --setprovideroutputsource modesetting NVIDIA-0
+          xrandr --auto
+        '';
+        description = ''
+          A script to execute when starting the display server.
+        '';
+      };
+
+      stopScript = mkOption {
+        type = types.str;
+        default = "";
+        description = ''
+          A script to execute when stopping the display server.
+        '';
+      };
+
       autoLogin = mkOption {
         default = {};
         description = ''
@@ -105,7 +138,7 @@ in
         '';
 
         type = types.submodule {
-	  options = {
+          options = {
             enable = mkOption {
               type = types.bool;
               default = false;
@@ -130,7 +163,7 @@ in
                 will work only the first time.
               '';
             };
-	  };
+          };
         };
       };
 
@@ -142,14 +175,16 @@ in
 
     assertions = [
       { assertion = cfg.autoLogin.enable -> cfg.autoLogin.user != null;
-        message = "SDDM auto-login requires services.xserver.displayManager.sddm.autoLogin.user to be set";
+        message = ''
+          SDDM auto-login requires services.xserver.displayManager.sddm.autoLogin.user to be set
+        '';
       }
       { assertion = cfg.autoLogin.enable -> elem defaultSessionName dmcfg.session.names;
         message = ''
           SDDM auto-login requires that services.xserver.desktopManager.default and
-	  services.xserver.windowMananger.default are set to valid values. The current
-	  default session: ${defaultSessionName} is not valid.
-	'';
+          services.xserver.windowMananger.default are set to valid values. The current
+          default session: ${defaultSessionName} is not valid.
+        '';
       }
     ];