From da13d40d003f94c39721a5b015bd7e5071313db5 Mon Sep 17 00:00:00 2001
From: ErrorNoInternet <errornointernet@envs.net>
Date: Mon, 6 Apr 2026 19:24:28 -0400
Subject: [PATCH] nixos/hyprland: add cap_sys_nice capability

On startup, Hyprland tries to set its own scheduling policy to SCHED_RR
for a boost in responsiveness when the system is under load. This requires
the cap_sys_nice capability to function.
---
 nixos/modules/programs/wayland/hyprland.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/nixos/modules/programs/wayland/hyprland.nix b/nixos/modules/programs/wayland/hyprland.nix
index 744f7af70fe5..8e6e7ea3f2f4 100644
--- a/nixos/modules/programs/wayland/hyprland.nix
+++ b/nixos/modules/programs/wayland/hyprland.nix
@@ -83,6 +83,15 @@ in
       {
         environment.systemPackages = [ cfg.package ];
 
+        # Hyprland needs permissions to give itself SCHED_RR on startup:
+        # https://github.com/hyprwm/Hyprland/blob/main/src/init/initHelpers.cpp
+        security.wrappers.Hyprland = {
+          owner = "root";
+          group = "root";
+          capabilities = "cap_sys_nice+ep";
+          source = lib.getExe cfg.package;
+        };
+
         xdg.portal = {
           enable = true;
           extraPortals = [ cfg.portalPackage ];