diff -uNrp linux-2.6.37-orig//drivers/gpu/drm/i915/i915_drv.h linux-2.6.37-changes//drivers/gpu/drm/i915/i915_drv.h
--- linux-2.6.37-orig//drivers/gpu/drm/i915/i915_drv.h	2011-01-04 19:50:19.000000000 -0500
+++ linux-2.6.37-changes//drivers/gpu/drm/i915/i915_drv.h	2011-01-06 02:36:02.428999999 -0500
@@ -35,6 +35,7 @@
 #include "intel_ringbuffer.h"
 #include <linux/io-mapping.h>
 #include <linux/i2c.h>
+#include <linux/pm_qos_params.h>
 #include <drm/intel-gtt.h>
 
 /* General customization:
@@ -674,6 +675,7 @@ typedef struct drm_i915_private {
 	int lvds_downclock;
 	struct work_struct idle_work;
 	struct timer_list idle_timer;
+	struct pm_qos_request_list pm_qos;
 	bool busy;
 	u16 orig_clock;
 	int child_dev_num;
diff -uNrp linux-2.6.37-orig//drivers/gpu/drm/i915/i915_irq.c linux-2.6.37-changes//drivers/gpu/drm/i915/i915_irq.c
--- linux-2.6.37-orig//drivers/gpu/drm/i915/i915_irq.c	2011-01-04 19:50:19.000000000 -0500
+++ linux-2.6.37-changes//drivers/gpu/drm/i915/i915_irq.c	2011-01-06 02:42:38.713000011 -0500
@@ -1216,10 +1216,20 @@ int i915_enable_vblank(struct drm_device
 	else if (INTEL_INFO(dev)->gen >= 4)
 		i915_enable_pipestat(dev_priv, pipe,
 				     PIPE_START_VBLANK_INTERRUPT_ENABLE);
-	else
+	else {
 		i915_enable_pipestat(dev_priv, pipe,
 				     PIPE_VBLANK_INTERRUPT_ENABLE);
+	}
 	spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
+
+	if (( IS_I945G(dev) || IS_I945GM(dev)) && !dev_priv->pm_qos.pm_qos_class)
+	/* Install a handle to prevent C-state starvation of the GPU
+	 * 945 platforms have an issue with vsync interrupts not
+	 * reaching cpu during deep c-state sleep (>C1)
+	 */
+		pm_qos_add_request(&dev_priv->pm_qos,
+				   PM_QOS_CPU_DMA_LATENCY,
+				   15); //>=20 won't work
 	return 0;
 }
 
@@ -1231,6 +1241,9 @@ void i915_disable_vblank(struct drm_devi
 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 	unsigned long irqflags;
 
+	if ((IS_I945G(dev) || IS_I945GM(dev)) && dev_priv->pm_qos.pm_qos_class)
+		pm_qos_remove_request(&dev_priv->pm_qos);
+
 	spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 	if (HAS_PCH_SPLIT(dev))
 		ironlake_disable_display_irq(dev_priv, (pipe == 0) ?