nixos/nvidia: use kernel suspend notifiers if available

Author: ccicnce113424

nixos/modules/hardware/video/nvidia.nix

@@ -20,6 +20,7 @@ let
   busIDType = lib.types.strMatching "([[:print:]]+:[0-9]{1,3}(@[0-9]{1,10})?:[0-9]{1,2}:[0-9])?";
   ibtSupport = useOpenModules || (nvidia_x11.ibtSupport or false);
   settingsFormat = pkgs.formats.keyValue { };
+  kernelSuspendNotifier = useOpenModules && lib.versionAtLeast nvidia_x11.version "595";
 in
 {
   options = {
@@ -592,7 +593,7 @@ in
               };
             in
             lib.mkMerge [
-              (lib.mkIf cfg.powerManagement.enable {
+              (lib.mkIf (cfg.powerManagement.enable && !kernelSuspendNotifier) {
                 nvidia-suspend = nvidiaService "suspend";
                 nvidia-hibernate = nvidiaService "hibernate";
                 nvidia-resume = (nvidiaService "resume") // {
@@ -669,6 +670,9 @@ in
               ++ lib.optional (
                 (offloadCfg.enable || cfg.modesetting.enable) && lib.versionAtLeast nvidia_x11.version "545"
               ) "nvidia-drm.fbdev=1"
+              ++ lib.optional (
+                cfg.powerManagement.enable && kernelSuspendNotifier
+              ) "nvidia.NVreg_UseKernelSuspendNotifiers=1"
               ++ lib.optional cfg.powerManagement.enable "nvidia.NVreg_PreserveVideoMemoryAllocations=1"
               ++ lib.optional useOpenModules "nvidia.NVreg_OpenRmEnableUnsupportedGpus=1"
               ++ lib.optional (config.boot.kernelPackages.kernel.kernelAtLeast "6.2" && !ibtSupport) "ibt=off";