diff -uNr linux-3.0/drivers/gpu/drm/i915/i915_drv.c linux-3.0-patched/drivers/gpu/drm/i915/i915_drv.c
--- linux-3.0/drivers/gpu/drm/i915/i915_drv.c	2011-07-22 04:17:23.000000000 +0200
+++ linux-3.0-patched/drivers/gpu/drm/i915/i915_drv.c	2011-07-25 14:58:38.568936763 +0200
@@ -61,7 +61,7 @@
 unsigned int i915_lvds_downclock = 0;
 module_param_named(lvds_downclock, i915_lvds_downclock, int, 0400);
 
-unsigned int i915_panel_use_ssc = 1;
+unsigned int i915_panel_use_ssc = 0;
 module_param_named(lvds_use_ssc, i915_panel_use_ssc, int, 0600);
 
 int i915_vbt_sdvo_panel_type = -1;
diff -uNr linux-3.0/drivers/gpu/drm/i915/i915_drv.h linux-3.0-patched/drivers/gpu/drm/i915/i915_drv.h
--- linux-3.0/drivers/gpu/drm/i915/i915_drv.h	2011-07-22 04:17:23.000000000 +0200
+++ linux-3.0-patched/drivers/gpu/drm/i915/i915_drv.h	2011-07-25 14:58:38.568936763 +0200
@@ -353,6 +353,7 @@
 	unsigned int lvds_vbt:1;
 	unsigned int int_crt_support:1;
 	unsigned int lvds_use_ssc:1;
+	unsigned int display_clock_mode:1;
 	int lvds_ssc_freq;
 	struct {
 		int rate;
diff -uNr linux-3.0/drivers/gpu/drm/i915/intel_bios.c linux-3.0-patched/drivers/gpu/drm/i915/intel_bios.c
--- linux-3.0/drivers/gpu/drm/i915/intel_bios.c	2011-07-22 04:17:23.000000000 +0200
+++ linux-3.0-patched/drivers/gpu/drm/i915/intel_bios.c	2011-07-25 22:49:27.773124618 +0200
@@ -285,6 +285,7 @@
 		dev_priv->lvds_use_ssc = general->enable_ssc;
 		dev_priv->lvds_ssc_freq =
 			intel_bios_ssc_frequency(dev, general->ssc_freq);
+		dev_priv->display_clock_mode = general->display_clock_mode;
 	}
 }
 
diff -uNr linux-3.0/drivers/gpu/drm/i915/intel_bios.h linux-3.0-patched/drivers/gpu/drm/i915/intel_bios.h
--- linux-3.0/drivers/gpu/drm/i915/intel_bios.h	2011-07-22 04:17:23.000000000 +0200
+++ linux-3.0-patched/drivers/gpu/drm/i915/intel_bios.h	2011-07-25 14:58:38.568936763 +0200
@@ -120,7 +120,9 @@
 	u8 ssc_freq:1;
 	u8 enable_lfp_on_override:1;
 	u8 disable_ssc_ddt:1;
-	u8 rsvd8:3; /* finish byte */
+	u8 rsvd7:1;
+	u8 display_clock_mode:1;
+	u8 rsvd8:1; /* finish byte */
 
         /* bits 3 */
 	u8 disable_smooth_vision:1;
diff -uNr linux-3.0/drivers/gpu/drm/i915/intel_display.c linux-3.0-patched/drivers/gpu/drm/i915/intel_display.c
--- linux-3.0/drivers/gpu/drm/i915/intel_display.c	2011-07-22 04:17:23.000000000 +0200
+++ linux-3.0-patched/drivers/gpu/drm/i915/intel_display.c	2011-07-25 22:51:48.973122522 +0200
@@ -4914,42 +4914,30 @@
 	 */
 	temp = I915_READ(PCH_DREF_CONTROL);
 	/* Always enable nonspread source */
+	temp &= ~DREF_SSC1_ENABLE;
+	temp &= ~DREF_SSC4_ENABLE;
+	temp &= ~DREF_SUPERSPREAD_SOURCE_ENABLE;
 	temp &= ~DREF_NONSPREAD_SOURCE_MASK;
-	temp |= DREF_NONSPREAD_SOURCE_ENABLE;
+	//temp |= DREF_NONSPREAD_SOURCE_ENABLE;
 	temp &= ~DREF_SSC_SOURCE_MASK;
-	temp |= DREF_SSC_SOURCE_ENABLE;
+	//temp |= DREF_SSC_SOURCE_ENABLE;
+	temp &= ~DREF_CPU_SOURCE_OUTPUT_MASK;
 	I915_WRITE(PCH_DREF_CONTROL, temp);
 
 	POSTING_READ(PCH_DREF_CONTROL);
 	udelay(200);
 
-	if (has_edp_encoder) {
-		if (intel_panel_use_ssc(dev_priv)) {
-			temp |= DREF_SSC1_ENABLE;
-			I915_WRITE(PCH_DREF_CONTROL, temp);
-
-			POSTING_READ(PCH_DREF_CONTROL);
-			udelay(200);
-		}
-		temp &= ~DREF_CPU_SOURCE_OUTPUT_MASK;
+	if (dev_priv->display_clock_mode)
+		temp |= DREF_NONSPREAD_CK505_ENABLE;
+	else
+		temp |= DREF_NONSPREAD_SOURCE_ENABLE;
+	if (has_edp_encoder &&
+		!intel_encoder_is_pch_edp(&has_edp_encoder->base))
+		temp |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
+	I915_WRITE(PCH_DREF_CONTROL, temp);
+	POSTING_READ(PCH_DREF_CONTROL);
+	udelay(200);
 
-		/* Enable CPU source on CPU attached eDP */
-		if (!intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
-			if (intel_panel_use_ssc(dev_priv))
-				temp |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
-			else
-				temp |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
-		} else {
-			/* Enable SSC on PCH eDP if needed */
-			if (intel_panel_use_ssc(dev_priv)) {
-				DRM_ERROR("enabling SSC on PCH\n");
-				temp |= DREF_SUPERSPREAD_SOURCE_ENABLE;
-			}
-		}
-		I915_WRITE(PCH_DREF_CONTROL, temp);
-		POSTING_READ(PCH_DREF_CONTROL);
-		udelay(200);
-	}
 
 	fp = clock.n << 16 | clock.m1 << 8 | clock.m2;
 	if (has_reduced_clock)