nixos/nvidia: use kernel suspend notifier 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 = {
@@ -614,7 +615,7 @@ 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") // {
@@ -681,6 +682,9 @@ in
             // lib.optionalAttrs (
               (offloadCfg.enable || cfg.modesetting.enable) && lib.versionAtLeast nvidia_x11.version "545"
             ) { nvidia-drm.fbdev = 1; }
+            // lib.optionalAttrs (cfg.powerManagement.enable && kernelSuspendNotifier) {
+              nvidia.NVreg_UseKernelSuspendNotifiers = 1;
+            }
             // lib.optionalAttrs cfg.powerManagement.enable { nvidia.NVreg_PreserveVideoMemoryAllocations = 1; }
             // lib.optionalAttrs useOpenModules { nvidia.NVreg_OpenRmEnableUnsupportedGpus = 1; }
             // lib.optionalAttrs cfg.powerManagement.finegrained {