From 2244f339c93a263d7453ea50f873077e886877a7 Mon Sep 17 00:00:00 2001
From: rope <fredrik@nordhammer.it>
Date: Sat, 25 Jul 2026 08:45:07 +0100
Subject: [PATCH] macbook: legacy DRM iface for immediate cursor updates

---
 hosts/hardware/FredOS-Macbook.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hosts/hardware/FredOS-Macbook.nix b/hosts/hardware/FredOS-Macbook.nix
index 78f2067..f5656eb 100644
--- a/hosts/hardware/FredOS-Macbook.nix
+++ b/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.