fix(hyprland,sway,uwsm): gate NVIDIA VRR env var behind nvidia GPU option

__GL_VRR_ALLOWED only applies to the NVIDIA driver but was set
unconditionally, making it dead config on any AMD/Intel-only host. Set
it only when khanelinix.hardware.gpu.nvidia.enable is true.

Author: khaneliman

modules/home/programs/graphical/wms/hyprland/default.nix

@@ -118,6 +118,8 @@ in
             XDG_SESSION_TYPE = "wayland";
             _JAVA_AWT_WM_NONREPARENTING = "1";
             __GL_GSYNC_ALLOWED = "0";
+          }
+          // lib.optionalAttrs (osConfig.khanelinix.hardware.gpu.nvidia.enable or false) {
             __GL_VRR_ALLOWED = "0";
           }
           // mkIf cfg.enableDebug {

modules/home/programs/graphical/wms/sway/default.nix

@@ -84,18 +84,22 @@ in
           wayvnc
         ];
 
-        sessionVariables = lib.mkIf (!(osConfig.khanelinix.programs.graphical.wms.sway.withUWSM or false)) {
-          CLUTTER_BACKEND = "wayland";
-          MOZ_ENABLE_WAYLAND = "1";
-          MOZ_USE_XINPUT2 = "1";
-          # NOTE: causes gldriverquery crash on wayland
-          # SDL_VIDEODRIVER = "wayland";
-          WLR_DRM_NO_ATOMIC = "1";
-          XDG_SESSION_TYPE = "wayland";
-          _JAVA_AWT_WM_NONREPARENTING = "1";
-          __GL_GSYNC_ALLOWED = "0";
-          __GL_VRR_ALLOWED = "0";
-        };
+        sessionVariables = lib.mkIf (!(osConfig.khanelinix.programs.graphical.wms.sway.withUWSM or false)) (
+          {
+            CLUTTER_BACKEND = "wayland";
+            MOZ_ENABLE_WAYLAND = "1";
+            MOZ_USE_XINPUT2 = "1";
+            # NOTE: causes gldriverquery crash on wayland
+            # SDL_VIDEODRIVER = "wayland";
+            WLR_DRM_NO_ATOMIC = "1";
+            XDG_SESSION_TYPE = "wayland";
+            _JAVA_AWT_WM_NONREPARENTING = "1";
+            __GL_GSYNC_ALLOWED = "0";
+          }
+          // lib.optionalAttrs (osConfig.khanelinix.hardware.gpu.nvidia.enable or false) {
+            __GL_VRR_ALLOWED = "0";
+          }
+        );
       };
 
       khanelinix = {

modules/nixos/programs/graphical/addons/uwsm/default.nix

@@ -28,7 +28,7 @@ in
           export XDG_SESSION_TYPE=wayland
           export _JAVA_AWT_WM_NONREPARENTING=1
           export __GL_GSYNC_ALLOWED=0
-          export __GL_VRR_ALLOWED=0
+          ${lib.optionalString config.khanelinix.hardware.gpu.nvidia.enable "export __GL_VRR_ALLOWED=0"}
         '';
         # Debug variables (commented out by default)
         #export AQ_TRACE="1"