diff --git a/nix/hosts/t14/configuration.nix b/nix/hosts/t14/configuration.nix
index a64773d..99aa612 100644
--- a/nix/hosts/t14/configuration.nix
+++ b/nix/hosts/t14/configuration.nix
@@ -31,8 +31,12 @@
   # nixpkgs.currentSystem = "x86_64-linux";
   nix.settings.trusted-users = ["@wheel" "root" "mko"];
 
-  # forbid hibernation due to zfs-on-root.
-  boot.kernelParams = ["amd_pstate=active" "nohibernate"];
+  boot.kernelParams = [
+    "amd_pstate=active"
+    # forbid hibernation due to zfs-on-root.
+    "nohibernate"
+    "amdgpu.backlight=0"
+  ];
 
   # Use the systemd-boot EFI boot loader.
   boot.loader.systemd-boot.enable = true;