--- nouveau_backlight.c.orig	2016-08-04 20:59:42.590183002 -0400
+++ nouveau_backlight.c	2016-08-04 21:08:25.291126244 -0400
@@ -36,6 +36,74 @@
 #include "nouveau_reg.h"
 #include "nouveau_encoder.h"
 
+
+#ifdef __powerpc__
+
+const int NV30_BL_CURVE[9] = {0x000,0x16d,0x1f7,0x281,0x30b,0x395,0x41f,0x4a9,0x534};
+
+static int
+nv30_get_intensity(struct backlight_device *bd)
+{
+        struct nouveau_drm *drm = bl_get_data(bd);
+        struct nvif_object *device = &drm->device.object;
+        int val = (nvif_rd32(device, NV30_PMC_BACKLIGHT) &
+                                   NV30_PMC_BACKLIGHT_MASK) >> 16;
+        int i;
+        for(i=0;i<sizeof(NV30_BL_CURVE)/sizeof(NV30_BL_CURVE[0]);i++)
+        {
+                if(NV30_BL_CURVE[i] == val) return i;
+        }
+
+        return sizeof(NV30_BL_CURVE)/sizeof(NV30_BL_CURVE[0]);
+
+}
+
+static int
+nv30_set_intensity(struct backlight_device *bd)
+{
+        struct nouveau_drm *drm = bl_get_data(bd);
+        struct nvif_object *device = &drm->device.object;
+        int val = bd->props.brightness;
+
+        nvif_wr32(device, NV30_PMC_BACKLIGHT,
+                 (NV30_BL_CURVE[val] << 16) + 0x80000535);
+
+        return 0;
+}
+
+static const struct backlight_ops nv30_bl_ops = {
+        .options = BL_CORE_SUSPENDRESUME,
+        .get_brightness = nv30_get_intensity,
+        .update_status = nv30_set_intensity,
+};
+
+static int
+nv30_backlight_init(struct drm_connector *connector)
+{
+        struct nouveau_drm *drm = nouveau_drm(connector->dev);
+        struct nvif_object *device = &drm->device.object;
+        struct backlight_properties props;
+        struct backlight_device *bd;
+
+        if (!(nvif_rd32(device, NV30_PMC_BACKLIGHT) & NV30_PMC_BACKLIGHT_MASK))
+                return 0;
+
+        memset(&props, 0, sizeof(struct backlight_properties));
+        props.type = BACKLIGHT_RAW;
+        props.max_brightness = sizeof(NV30_BL_CURVE)/sizeof(NV30_BL_CURVE[0])-1;
+        bd = backlight_device_register("nv_backlight", connector->kdev, drm,
+                                       &nv30_bl_ops, &props);
+        if (IS_ERR(bd))
+                return PTR_ERR(bd);
+        drm->backlight = bd;
+        bd->props.brightness = nv30_get_intensity(bd);
+        backlight_update_status(bd);
+
+        return 0;
+}
+
+#endif
+
 static int
 nv40_get_intensity(struct backlight_device *bd)
 {
@@ -227,6 +295,10 @@
 			continue;
 
 		switch (device->info.family) {
+#ifdef __powerpc__
+                case NV_DEVICE_INFO_V0_RANKINE:
+                        return nv30_backlight_init(connector);
+#endif
 		case NV_DEVICE_INFO_V0_CURIE:
 			return nv40_backlight_init(connector);
 		case NV_DEVICE_INFO_V0_TESLA: