macbook: legacy DRM iface for immediate cursor updates

hosts/hardware/FredOS-Macbook.nix

@@ -40,6 +40,11 @@
   hardware.graphics.extraPackages = [ pkgs.intel-vaapi-driver ];
   environment.sessionVariables.LIBVA_DRIVER_NAME = "i965";
 
+  # Legacy DRM iface: cursor plane moves via immediate ioctl instead of
+  # vblank-batched atomic commits — cursor latency drops below the 60Hz
+  # frame floor. Revert if output glitches (legacy path is less tested).
+  environment.sessionVariables.AQ_NO_ATOMIC = "1";
+
   # Pin to the 6.12 LTS kernel: the out-of-tree broadcom_sta (Wi-Fi) and
   # facetimehd (iSight) modules don't build against linuxPackages_latest
   # (7.x) — broadcom-sta's wl_cfg80211 ops no longer match the cfg80211 API.

settings/hyprland.nix

@@ -117,9 +117,7 @@ in
             decoration = {
               rounding = 8;
               blur = {
-                # Haswell iGPU can't afford 3-pass blur every frame — the
-                # blown frame budget shows up as pointer/input latency.
-                enabled = !isMacbook;
+                enabled = true;
                 size = 1;
                 passes = 3;
               };