diff -ur old/drivers/gpu/drm/i915/i915_drv.h linux-3.18.0-0.rc6.git0.1.1awb.x86_64/drivers/gpu/drm/i915/i915_drv.h
--- old/drivers/gpu/drm/i915/i915_drv.h	2014-11-24 16:07:51.597050369 -0800
+++ linux-3.18.0-0.rc6.git0.1.1awb.x86_64/drivers/gpu/drm/i915/i915_drv.h	2014-11-24 16:08:28.199423974 -0800
@@ -2223,6 +2223,7 @@
 	bool disable_vtd_wa;
 	int use_mmio_flip;
 	bool mmio_debug;
+	bool force_backlight_pmic;
 };
 extern struct i915_params i915 __read_mostly;
 
diff -ur old/drivers/gpu/drm/i915/i915_params.c linux-3.18.0-0.rc6.git0.1.1awb.x86_64/drivers/gpu/drm/i915/i915_params.c
--- old/drivers/gpu/drm/i915/i915_params.c	2014-11-24 16:07:51.590050297 -0800
+++ linux-3.18.0-0.rc6.git0.1.1awb.x86_64/drivers/gpu/drm/i915/i915_params.c	2014-11-24 16:08:28.200423985 -0800
@@ -51,6 +51,7 @@
 	.disable_vtd_wa = 0,
 	.use_mmio_flip = 0,
 	.mmio_debug = 0,
+	.force_backlight_pmic = 0,
 };
 
 module_param_named(modeset, i915.modeset, int, 0400);
@@ -173,3 +174,7 @@
 MODULE_PARM_DESC(mmio_debug,
 	"Enable the MMIO debug code (default: false). This may negatively "
 	"affect performance.");
+
+module_param_named(force_backlight_pmic, i915.force_backlight_pmic, bool, 0600);
+MODULE_PARM_DESC(force_backlight_pmic,
+	"Force backlight adjusting through pmic (default: false).");
diff -ur old/drivers/gpu/drm/i915/intel_dsi.c linux-3.18.0-0.rc6.git0.1.1awb.x86_64/drivers/gpu/drm/i915/intel_dsi.c
--- old/drivers/gpu/drm/i915/intel_dsi.c	2014-11-24 16:07:51.590050297 -0800
+++ linux-3.18.0-0.rc6.git0.1.1awb.x86_64/drivers/gpu/drm/i915/intel_dsi.c	2014-11-24 16:08:14.207281155 -0800
@@ -140,6 +140,8 @@
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	struct intel_connector *intel_connector =
+		&intel_dsi->attached_connector->base;
 	int pipe = intel_crtc->pipe;
 	u32 temp;
 
@@ -163,6 +165,8 @@
 		I915_WRITE(MIPI_PORT_CTRL(pipe), temp | DPI_ENABLE);
 		POSTING_READ(MIPI_PORT_CTRL(pipe));
 	}
+
+	intel_panel_enable_backlight(intel_connector);
 }
 
 static void intel_dsi_pre_enable(struct intel_encoder *encoder)
@@ -237,6 +241,8 @@
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	struct intel_connector *intel_connector =
+		&intel_dsi->attached_connector->base;
 	int pipe = intel_crtc->pipe;
 	u32 temp;
 
@@ -253,6 +259,8 @@
 		msleep(2);
 	}
 
+	intel_panel_disable_backlight(intel_connector);
+
 	/* Panel commands can be sent when clock is in LP11 */
 	I915_WRITE(MIPI_DEVICE_READY(pipe), 0x0);
 
@@ -670,6 +678,7 @@
 
 	DRM_DEBUG_KMS("\n");
 	intel_panel_fini(&intel_connector->panel);
+	intel_panel_destroy_backlight(connector);
 	drm_connector_cleanup(connector);
 	kfree(connector);
 }
@@ -710,6 +710,7 @@
 	struct drm_display_mode *fixed_mode = NULL;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	const struct intel_dsi_device *dsi;
+	int pipe = intel_crtc->pipe;
 	unsigned int i;
 
 	DRM_DEBUG_KMS("\n");
@@ -786,6 +795,7 @@
 
 	fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 	intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
+	intel_panel_setup_backlight(connector, pipe);
 
 	return;
 
diff -ur old/drivers/gpu/drm/i915/intel_panel.c linux-3.18.0-0.rc6.git0.1.1awb.x86_64/drivers/gpu/drm/i915/intel_panel.c
--- old/drivers/gpu/drm/i915/intel_panel.c	2014-11-24 16:07:51.590050297 -0800
+++ linux-3.18.0-0.rc6.git0.1.1awb.x86_64/drivers/gpu/drm/i915/intel_panel.c	2014-11-24 16:08:28.200423985 -0800
@@ -31,6 +31,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/moduleparam.h>
+#include <linux/mfd/intel_soc_pmic.h>
 #include "intel_drv.h"
 
 void
@@ -532,6 +533,11 @@
 	return _vlv_get_backlight(dev, pipe);
 }
 
+static u32 vlv_pmic_get_backlight(struct intel_connector *connector)
+{
+	return intel_soc_pmic_readb(0x4E);
+}
+
 static u32 intel_panel_get_backlight(struct intel_connector *connector)
 {
 	struct drm_device *dev = connector->base.dev;
@@ -607,6 +613,11 @@
 	I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 }
 
+static void vlv_pmic_set_backlight(struct intel_connector *connector, u32 level)
+{
+	intel_soc_pmic_writeb(0x4E, level);
+}
+
 static void
 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 {
@@ -726,6 +737,14 @@
 	I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 }
 
+static void vlv_pmic_disable_backlight(struct intel_connector *connector)
+{
+	intel_panel_actually_set_backlight(connector, 0);
+
+	intel_soc_pmic_writeb(0x51, 0x00);
+	intel_soc_pmic_writeb(0x4B, 0x7F);
+}
+
 void intel_panel_disable_backlight(struct intel_connector *connector)
 {
 	struct drm_device *dev = connector->base.dev;
@@ -930,6 +949,17 @@
 	I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 }
 
+static void vlv_pmic_enable_backlight(struct intel_connector *connector)
+{
+	struct intel_panel *panel = &connector->panel;
+
+	intel_soc_pmic_writeb(0x4B, 0xFF);
+	intel_soc_pmic_writeb(0x4E, 0xFF);
+	intel_soc_pmic_writeb(0x51, 0x01);
+
+	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+}
+
 void intel_panel_enable_backlight(struct intel_connector *connector)
 {
 	struct drm_device *dev = connector->base.dev;
@@ -1273,6 +1303,20 @@
 	return 0;
 }
 
+static int vlv_pmic_setup_backlight(struct intel_connector *connector)
+{
+	struct intel_panel *panel = &connector->panel;
+
+	printk("vlv_pmic_setup_backlight\n");
+	panel->backlight.present = 1;
+	panel->backlight.min = 0x00;
+	panel->backlight.max = 0xFF;
+	panel->backlight.level = 20;
+	panel->backlight.enabled = 1;
+
+	return 0;
+}
+
 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
 {
 	struct drm_device *dev = connector->dev;
@@ -1342,11 +1386,19 @@
 		dev_priv->display.set_backlight = pch_set_backlight;
 		dev_priv->display.get_backlight = pch_get_backlight;
 	} else if (IS_VALLEYVIEW(dev)) {
-		dev_priv->display.setup_backlight = vlv_setup_backlight;
-		dev_priv->display.enable_backlight = vlv_enable_backlight;
-		dev_priv->display.disable_backlight = vlv_disable_backlight;
-		dev_priv->display.set_backlight = vlv_set_backlight;
-		dev_priv->display.get_backlight = vlv_get_backlight;
+		if (i915.force_backlight_pmic) {
+			dev_priv->display.setup_backlight = vlv_pmic_setup_backlight;
+			dev_priv->display.enable_backlight = vlv_pmic_enable_backlight;
+			dev_priv->display.disable_backlight = vlv_pmic_disable_backlight;
+			dev_priv->display.set_backlight = vlv_pmic_set_backlight;
+			dev_priv->display.get_backlight = vlv_pmic_get_backlight;
+		} else {
+			dev_priv->display.setup_backlight = vlv_setup_backlight;
+			dev_priv->display.enable_backlight = vlv_enable_backlight;
+			dev_priv->display.disable_backlight = vlv_disable_backlight;
+			dev_priv->display.set_backlight = vlv_set_backlight;
+			dev_priv->display.get_backlight = vlv_get_backlight;
+		}
 	} else if (IS_GEN4(dev)) {
 		dev_priv->display.setup_backlight = i965_setup_backlight;
 		dev_priv->display.enable_backlight = i965_enable_backlight;
diff -ur old/drivers/mfd/intel_soc_pmic_core.c linux-3.18.0-0.rc6.git0.1.1awb.x86_64/drivers/mfd/intel_soc_pmic_core.c
--- old/drivers/mfd/intel_soc_pmic_core.c	2014-11-24 16:07:51.844052890 -0800
+++ linux-3.18.0-0.rc6.git0.1.1awb.x86_64/drivers/mfd/intel_soc_pmic_core.c	2014-11-24 16:08:14.207281155 -0800
@@ -26,6 +26,8 @@
 #include <linux/mfd/intel_soc_pmic.h>
 #include "intel_soc_pmic_core.h"
 
+static struct intel_soc_pmic *pmic_hack = NULL;
+
 /*
  * On some boards the PMIC interrupt may come from a GPIO line.
  * Try to lookup the ACPI table and see if such connection exists. If not,
@@ -64,6 +66,7 @@
 	config = (struct intel_soc_pmic_config *)id->driver_data;
 
 	pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
+	pmic_hack = pmic;
 	dev_set_drvdata(dev, pmic);
 
 	pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
@@ -135,6 +138,38 @@
 }
 #endif
 
+int intel_soc_pmic_readb(int reg)
+{
+	int ret;
+	unsigned int val;
+
+	if (!pmic_hack) {
+		ret = -EIO;
+	} else {
+		ret = regmap_read(pmic_hack->regmap, reg, &val);
+		if (!ret) {
+			ret = val;
+		}
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL(intel_soc_pmic_readb);
+
+int intel_soc_pmic_writeb(int reg, u8 val)
+{
+	int ret;
+
+	if (!pmic_hack) {
+		ret = -EIO;
+	} else {
+		ret = regmap_write(pmic_hack->regmap, reg, val);
+	}
+	return ret;
+}
+EXPORT_SYMBOL(intel_soc_pmic_writeb);
+
+
 static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
 			 intel_soc_pmic_resume);
 
diff -ur old/include/linux/mfd/intel_soc_pmic.h linux-3.18.0-0.rc6.git0.1.1awb.x86_64/include/linux/mfd/intel_soc_pmic.h
--- old/include/linux/mfd/intel_soc_pmic.h	2014-11-24 16:07:46.912002548 -0800
+++ linux-3.18.0-0.rc6.git0.1.1awb.x86_64/include/linux/mfd/intel_soc_pmic.h	2014-11-24 16:08:14.207281155 -0800
@@ -27,4 +27,8 @@
 	struct regmap_irq_chip_data *irq_chip_data;
 };
 
+int intel_soc_pmic_readb(int reg);
+int intel_soc_pmic_writeb(int reg, u8 val);
+
+
 #endif	/* __INTEL_SOC_PMIC_H__ */