diff -u a/i915_suspend.c b/i915_suspend.c
--- a/i915_suspend.c	2012-08-26 18:02:30.820255568 +0200
+++ b/i915_suspend.c	2012-08-26 18:02:34.180256573 +0200
@@ -877,6 +877,15 @@
 		I915_WRITE(IMR, dev_priv->saveIMR);
 	}
 
+	mutex_unlock(&dev->struct_mutex);
+
+	if (drm_core_check_feature(dev, DRIVER_MODESET))
+		intel_init_clock_gating(dev);
+
+	intel_enable_gt_powersave(dev);
+
+	mutex_lock(&dev->struct_mutex);
+
 	/* Cache mode state */
 	I915_WRITE(CACHE_MODE_0, dev_priv->saveCACHE_MODE_0 | 0xffff0000);