From bb799bdb790c1ba09dd3c40450e1373ac4f62f6a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?m=C3=BCde?= <git@darkest.space>
Date: Wed, 1 Jul 2026 19:06:16 +0200
Subject: [PATCH] fix brightnessctl

---
 nixosConfigurations/muede-lpt2/default.nix | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/nixosConfigurations/muede-lpt2/default.nix b/nixosConfigurations/muede-lpt2/default.nix
index c62e807..3fbabf3 100644
--- a/nixosConfigurations/muede-lpt2/default.nix
+++ b/nixosConfigurations/muede-lpt2/default.nix
@@ -37,9 +37,12 @@
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIO1CRn4yYTL4XUdCebE8Z4ZeuMujBjorTdWifg911EOv pc2 home roaming"
     ];
 
-    # `programs.adb` removed in nixpkgs 26.05 (systemd 258 handles uaccess); add pkgs.android-tools to systemPackages if adb is needed
-    # `programs.light` removed in nixpkgs 26.05; replace with brightnessctl or hardware.acpilight when re-enabling
-    environment.systemPackages = [ pkgs.android-tools ];
+    # brightnessctl's udev rules grant the `video` group write access to backlight brightness (muede is in `video`)
+    environment.systemPackages = [
+      pkgs.android-tools
+      pkgs.brightnessctl
+    ];
+    services.udev.packages = [ pkgs.brightnessctl ];
 
     networking.firewall.allowedTCPPorts = [
       8776