diff --git a/surfacebook-configuration.nix b/surfacebook-configuration.nix
index 5d46c33..96476f7 100644
--- a/surfacebook-configuration.nix
+++ b/surfacebook-configuration.nix
@@ -47,4 +47,7 @@ in
   boot.extraModprobeConfig = ''
     options nvidia NVreg_PreserveVideoMemoryAllocations=1 NVreg_TemporaryFilePath=/var/tmp
   '';
+
+  # change backlight agent
+  boot.kernelParams = [ "acpi_osi=!" "acpi_osi=\"Windows 2015\""];
 }