nixos-hardware/common/gpu/intel/sandy-bridge/default.nix

{
  imports = [ ../. ];

  # Enables RC6, RC6p and RC6pp.
  # Last two are only available on Sandy Bridge CPUs (circa 2011).
  boot.kernelParams = [ "i915.enable_rc6=7" ];

  hardware.intelgpu.vaapiDriver = "intel-vaapi-driver";
}