Merge pull request #29697 from zimbatm/gdm-on-nvidia

GDM fixes

nixos/modules/hardware/video/nvidia.nix

@@ -40,6 +40,12 @@ in
 {
 
   config = mkIf enabled {
+    assertions = [
+      {
+        assertion = services.xserver.displayManager.gdm.wayland;
+        message = "NVidia drivers don't support wayland";
+      }
+    ];
 
     services.xserver.drivers = singleton
       { name = "nvidia"; modules = [ nvidia_x11.bin ]; libPath = [ nvidia_x11 ]; };
@@ -62,11 +68,16 @@ in
     boot.extraModulePackages = [ nvidia_x11.bin ];
 
     # nvidia-uvm is required by CUDA applications.
-    boot.kernelModules = [ "nvidia-uvm" ];
+    boot.kernelModules = [ "nvidia-uvm" ] ++
+      lib.optionals config.services.xserver.enable [ "nvidia" "nvidia_modeset" "nvidia_drm" ];
+
 
     # Create /dev/nvidia-uvm when the nvidia-uvm module is loaded.
     services.udev.extraRules =
       ''
+        KERNEL=="nvidia", RUN+="${pkgs.stdenv.shell} -c 'mknod -m 666 /dev/nvidiactl c $(grep nvidia-frontend /proc/devices | cut -d \  -f 1) 255'"
+        KERNEL=="nvidia_modeset", RUN+="${pkgs.stdenv.shell} -c 'mknod -m 666 /dev/nvidia-modeset c $(grep nvidia-frontend /proc/devices | cut -d \  -f 1) 254'"
+        KERNEL=="card*", SUBSYSTEM=="drm", DRIVERS=="nvidia", RUN+="${pkgs.stdenv.shell} -c 'mknod -m 666 /dev/nvidia%n c $(grep nvidia-frontend /proc/devices | cut -d \  -f 1) %n'"
         KERNEL=="nvidia_uvm", RUN+="${pkgs.stdenv.shell} -c 'mknod -m 666 /dev/nvidia-uvm c $(grep nvidia-uvm /proc/devices | cut -d \  -f 1) 0'"
       '';
 

nixos/modules/services/x11/display-managers/gdm.nix

@@ -64,6 +64,14 @@ in
         };
       };
 
+      wayland = mkOption {
+        default = true;
+        description = ''
+          Allow GDM run on Wayland instead of Xserver
+        '';
+        type = types.bool;
+      };
+
     };
 
   };
@@ -94,6 +102,7 @@ in
     # GDM needs different xserverArgs, presumable because using wayland by default.
     services.xserver.tty = null;
     services.xserver.display = null;
+    services.xserver.verbose = null;
 
     services.xserver.displayManager.job =
       {
@@ -139,6 +148,7 @@ in
     # presented and there's a little delay.
     environment.etc."gdm/custom.conf".text = ''
       [daemon]
+      WaylandEnable=${if cfg.gdm.wayland then "true" else "false"}
       ${optionalString cfg.gdm.autoLogin.enable (
         if cfg.gdm.autoLogin.delay > 0 then ''
           TimedLoginEnable=true

nixos/modules/services/x11/xserver.nix

@@ -480,6 +480,15 @@ in
         '';
       };
 
+      verbose = mkOption {
+        type = types.nullOr types.int;
+        default = 3;
+        example = 7;
+        description = ''
+          Controls verbosity of X logging.
+        '';
+      };
+
       useGlamor = mkOption {
         type = types.bool;
         default = false;
@@ -631,10 +640,11 @@ in
       [ "-config ${configFile}"
         "-xkbdir" "${cfg.xkbDir}"
         # Log at the default verbosity level to stderr rather than /var/log/X.*.log.
-        "-verbose" "3" "-logfile" "/dev/null"
+         "-logfile" "/dev/null"
       ] ++ optional (cfg.display != null) ":${toString cfg.display}"
         ++ optional (cfg.tty     != null) "vt${toString cfg.tty}"
         ++ optional (cfg.dpi     != null) "-dpi ${toString cfg.dpi}"
+        ++ optional (cfg.verbose != null) "-verbose ${toString cfg.verbose}"
         ++ optional (!cfg.enableTCP) "-nolisten tcp"
         ++ optional (cfg.autoRepeatDelay != null) "-ardelay ${toString cfg.autoRepeatDelay}"
         ++ optional (cfg.autoRepeatInterval != null) "-arinterval ${toString cfg.autoRepeatInterval}"