From 19c0c04f614945bed1bca0e2eba8e7faaa6c7d0e Mon Sep 17 00:00:00 2001
From: Yegor Timoshenko <yegortimoshenko@gmail.com>
Date: Wed, 27 Dec 2017 21:39:31 +0000
Subject: apple/macbook-air/4: enable RC6p, RC6pp GPU sleep states

---
 apple/macbook-air/4/default.nix           | 5 ++++-
 common/cpu/intel/sandy-bridge/default.nix | 9 +++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)
 create mode 100644 common/cpu/intel/sandy-bridge/default.nix

diff --git a/apple/macbook-air/4/default.nix b/apple/macbook-air/4/default.nix
index 146289d..181a099 100644
--- a/apple/macbook-air/4/default.nix
+++ b/apple/macbook-air/4/default.nix
@@ -1,7 +1,10 @@
 { lib, ... }:
 
 {
-  imports = [ ../. ];
+  imports = [
+    ../.
+    ../../../common/cpu/intel/sandy-bridge
+  ];
 
   boot.kernelParams = [
     "acpi_backlight=vendor"
diff --git a/common/cpu/intel/sandy-bridge/default.nix b/common/cpu/intel/sandy-bridge/default.nix
new file mode 100644
index 0000000..682815c
--- /dev/null
+++ b/common/cpu/intel/sandy-bridge/default.nix
@@ -0,0 +1,9 @@
+{
+  imports = [ ../. ];
+
+  # Enables RC6, RC6p and RC6pp.
+  # Last two are only available on Sandy Bridge CPUs (circa 2011).
+  boot.kernelParams = [
+    "i915.enable_rc6=7"
+  ];
+}
-- 
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