Index: dev/drm/i915_dma.c
===================================================================
--- dev/drm/i915_dma.c	(revision 189057)
+++ dev/drm/i915_dma.c	(working copy)
@@ -900,6 +900,9 @@
 
 	intel_opregion_init(dev);
 #endif
+	if(dev->msi_enabled)
+		I915_WRITE16(PCIR_COMMAND, (I915_READ16(PCIR_COMMAND) | 0x400));
+
 	DRM_SPININIT(&dev_priv->user_irq_lock, "userirq");
 
 	return ret;