diff -ur a/drivers/gpu/drm/nouveau/nouveau_backlight.c b/drivers/gpu/drm/nouveau/nouveau_backlight.c
--- a/drivers/gpu/drm/nouveau/nouveau_backlight.c	2014-12-07 23:21:05.000000000 +0100
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c	2015-02-23 14:29:19.263677836 +0100
@@ -173,6 +173,22 @@
 	.update_status = nva3_set_intensity,
 };
 
+int
+nouveau_backlight_config(struct nouveau_drm *drm)
+{
+	struct backlight_device *bd = drm->backlight;
+	struct nvif_device *device = &drm->device;
+	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
+
+	if (device->info.chipset <= 0xa0 ||
+	    device->info.chipset == 0xaa ||
+	    device->info.chipset == 0xac)
+		nvif_wr32(device, NV50_PDISP_SOR_PWM_DIV(nv_encoder->or), 0x5e);
+
+	return 0;
+
+}
+
 static int
 nv50_backlight_init(struct drm_connector *connector)
 {
diff -ur a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
--- a/drivers/gpu/drm/nouveau/nouveau_display.c	2014-12-07 23:21:05.000000000 +0100
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c	2015-02-23 14:30:42.755337580 +0100
@@ -608,6 +608,12 @@
 
 	nouveau_display_init(dev);
 
+	/* configure backlight params */
+	if (drm->backlight) {
+		nouveau_backlight_config(drm);
+	}
+
+
 	/* Force CLUT to get re-loaded during modeset */
 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 		struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
diff -ur a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h
--- a/drivers/gpu/drm/nouveau/nouveau_display.h	2014-12-07 23:21:05.000000000 +0100
+++ b/drivers/gpu/drm/nouveau/nouveau_display.h	2015-02-23 14:32:06.376999909 +0100
@@ -88,6 +88,7 @@
 int nouveau_crtc_set_config(struct drm_mode_set *set);
 #ifdef CONFIG_DRM_NOUVEAU_BACKLIGHT
 extern int nouveau_backlight_init(struct drm_device *);
+extern int nouveau_backlight_config(struct nouveau_drm *);
 extern void nouveau_backlight_exit(struct drm_device *);
 #else
 static inline int
@@ -95,6 +96,12 @@
 {
 	return 0;
 }
+
+static inline int
+nouveau_backlight_config(struct nouveau_drm *connector)
+{
+	return 0;
+}
 
 static inline void
 nouveau_backlight_exit(struct drm_device *dev) {