From 00f0381893eb5c59334b33e9b4e835f9bd1e5f2a Mon Sep 17 00:00:00 2001
From: Florian RICHER <florian.richer@protonmail.com>
Date: Sat, 19 Jul 2025 21:51:48 +0200
Subject: [PATCH] monado: Add amdgpu patch + disable for perso-desktop

---
 hosts/perso-desktop/configuration.nix |  2 --
 hosts/perso-desktop/home.nix          |  2 --
 modules/system/services/monado.nix    | 19 +++++++++++++++++++
 3 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/hosts/perso-desktop/configuration.nix b/hosts/perso-desktop/configuration.nix
index a797ad4..50ee3e6 100644
--- a/hosts/perso-desktop/configuration.nix
+++ b/hosts/perso-desktop/configuration.nix
@@ -55,8 +55,6 @@
       printing.enable = true;
       steering-wheel.enable = true;
     };
-
-    services.monado.enable = true;
   };
 
   chaotic.mesa-git = {
diff --git a/hosts/perso-desktop/home.nix b/hosts/perso-desktop/home.nix
index 72a2638..196e7fc 100644
--- a/hosts/perso-desktop/home.nix
+++ b/hosts/perso-desktop/home.nix
@@ -9,8 +9,6 @@
       kitty.enable = true;
     };
 
-    configs.monado.enable = true;
-
     editors = {
       neovim.enable = true;
       vscode.enable = true;
diff --git a/modules/system/services/monado.nix b/modules/system/services/monado.nix
index 48605ca..045a523 100644
--- a/modules/system/services/monado.nix
+++ b/modules/system/services/monado.nix
@@ -2,6 +2,7 @@
 
 with lib;
 let
+  cfgAmdgpu = config.modules.system.hardware.graphics.amdgpu;
   cfg = config.modules.system.services.monado;
 in
 {
@@ -9,8 +10,15 @@ in
     enable = mkEnableOption ''
       Enable monado with my custom configurations
     '';
+
+    enableAmdgpuPatch = mkOption {
+      type = types.bool;
+      description = "Patch kernel to disable CAP_SYS_NICE on amdgpu. Required to allow high priority queues.";
+      default = cfgAmdgpu.enable;
+    };
   };
   config = mkIf cfg.enable {
+    # https://wiki.nixos.org/wiki/VR
     # https://github.com/NixOS/nixpkgs/issues/258196
     services.monado = {
       enable = true;
@@ -28,5 +36,16 @@ in
       XRT_COMPOSITOR_COMPUTE = "1";
       WMR_HANDTRACKING = "0";
     };
+
+    boot.kernelPatches = mkIf cfg.enableAmdgpuPatch [
+      {
+        name = "amdgpu-ignore-ctx-privileges";
+        patch = pkgs.fetchpatch {
+          name = "cap_sys_nice_begone.patch";
+          url = "https://github.com/Frogging-Family/community-patches/raw/master/linux61-tkg/cap_sys_nice_begone.mypatch";
+          hash = "sha256-Y3a0+x2xvHsfLax/uwycdJf3xLxvVfkfDVqjkxNaYEo=";
+        };
+      }
+    ];
   };
 }
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