diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 11d7a72c22d9..140b9525b48a 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1516,17 +1516,33 @@ bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
 }
 EXPORT_SYMBOL(drm_fb_helper_initial_config);
 
-bool drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
+/**
+ * drm_fb_helper_hotplug_event - respond to a hotplug notification by
+ *                               probing all the outputs attached to the fb.
+ * @fb_helper: the drm_fb_helper
+ *
+ * LOCKING:
+ * Called at runtime, must take mode config lock.
+ *
+ * Scan the connectors attached to the fb_helper and try to put together a
+ * setup after *notification of a change in output configuration.
+ *
+ * RETURNS:
+ * 0 on success and a non-zero error code otherwise.
+ */
+int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
 {
+	struct drm_device *dev = fb_helper->dev;
 	int count = 0;
 	u32 max_width, max_height, bpp_sel;
 	bool bound = false, crtcs_bound = false;
 	struct drm_crtc *crtc;
 
 	if (!fb_helper->fb)
-		return false;
+		return 0;
 
-	list_for_each_entry(crtc, &fb_helper->dev->mode_config.crtc_list, head) {
+	mutex_lock(&dev->mode_config.mutex);
+	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 		if (crtc->fb)
 			crtcs_bound = true;
 		if (crtc->fb == fb_helper->fb)
@@ -1535,7 +1551,8 @@ bool drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
 
 	if (!bound && crtcs_bound) {
 		fb_helper->delayed_hotplug = true;
-		return false;
+		mutex_unlock(&dev->mode_config.mutex);
+		return 0;
 	}
 	DRM_DEBUG_KMS("\n");
 
@@ -1546,6 +1563,7 @@ bool drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
 	count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
 						    max_height);
 	drm_setup_crtcs(fb_helper);
+	mutex_unlock(&dev->mode_config.mutex);
 
 	return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
 }
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index c20eac3379e6..9073e3bfb08c 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -1780,7 +1780,10 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
 
 
 	mc_shared_chmap = RREG32(MC_SHARED_CHMAP);
-	mc_arb_ramcfg = RREG32(MC_ARB_RAMCFG);
+	if (rdev->flags & RADEON_IS_IGP)
+		mc_arb_ramcfg = RREG32(FUS_MC_ARB_RAMCFG);
+	else
+		mc_arb_ramcfg = RREG32(MC_ARB_RAMCFG);
 
 	switch (rdev->config.evergreen.max_tile_pipes) {
 	case 1:
diff --git a/drivers/gpu/drm/radeon/evergreend.h b/drivers/gpu/drm/radeon/evergreend.h
index 94533849927e..fc40e0cc3451 100644
--- a/drivers/gpu/drm/radeon/evergreend.h
+++ b/drivers/gpu/drm/radeon/evergreend.h
@@ -200,6 +200,7 @@
 #define		BURSTLENGTH_SHIFT				9
 #define		BURSTLENGTH_MASK				0x00000200
 #define		CHANSIZE_OVERRIDE				(1 << 11)
+#define	FUS_MC_ARB_RAMCFG				0x2768
 #define	MC_VM_AGP_TOP					0x2028
 #define	MC_VM_AGP_BOT					0x202C
 #define	MC_VM_AGP_BASE					0x2030
diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index dd881d035f09..90dfb2b8cf03 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1574,9 +1574,17 @@ struct radeon_encoder_atom_dig *radeon_atombios_get_lvds_info(struct
 			ATOM_FAKE_EDID_PATCH_RECORD *fake_edid_record;
 			ATOM_PANEL_RESOLUTION_PATCH_RECORD *panel_res_record;
 			bool bad_record = false;
-			u8 *record = (u8 *)(mode_info->atom_context->bios +
-					    data_offset +
-					    le16_to_cpu(lvds_info->info.usModePatchTableOffset));
+			u8 *record;
+
+			if ((frev == 1) && (crev < 2))
+				/* absolute */
+				record = (u8 *)(mode_info->atom_context->bios +
+						le16_to_cpu(lvds_info->info.usModePatchTableOffset));
+			else
+				/* relative */
+				record = (u8 *)(mode_info->atom_context->bios +
+						data_offset +
+						le16_to_cpu(lvds_info->info.usModePatchTableOffset));
 			while (*record != ATOM_RECORD_END_TYPE) {
 				switch (*record) {
 				case LCD_MODE_PATCH_RECORD_MODE_TYPE:
diff --git a/drivers/gpu/drm/radeon/reg_srcs/cayman b/drivers/gpu/drm/radeon/reg_srcs/cayman
index 6334f8ac1209..0aa8e85a9457 100644
--- a/drivers/gpu/drm/radeon/reg_srcs/cayman
+++ b/drivers/gpu/drm/radeon/reg_srcs/cayman
@@ -33,6 +33,7 @@ cayman 0x9400
 0x00008E48 SQ_EX_ALLOC_TABLE_SLOTS
 0x00009100 SPI_CONFIG_CNTL
 0x0000913C SPI_CONFIG_CNTL_1
+0x00009508 TA_CNTL_AUX
 0x00009830 DB_DEBUG
 0x00009834 DB_DEBUG2
 0x00009838 DB_DEBUG3
diff --git a/drivers/gpu/drm/radeon/reg_srcs/evergreen b/drivers/gpu/drm/radeon/reg_srcs/evergreen
index 7e1637176e08..0e28cae7ea43 100644
--- a/drivers/gpu/drm/radeon/reg_srcs/evergreen
+++ b/drivers/gpu/drm/radeon/reg_srcs/evergreen
@@ -46,6 +46,7 @@ evergreen 0x9400
 0x00008E48 SQ_EX_ALLOC_TABLE_SLOTS
 0x00009100 SPI_CONFIG_CNTL
 0x0000913C SPI_CONFIG_CNTL_1
+0x00009508 TA_CNTL_AUX
 0x00009700 VC_CNTL
 0x00009714 VC_ENHANCE
 0x00009830 DB_DEBUG
diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index e01cacba685f..498b284e5ef9 100644
--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -219,9 +219,6 @@ static int vga_switchto_stage1(struct vga_switcheroo_client *new_client)
 	int i;
 	struct vga_switcheroo_client *active = NULL;
 
-	if (new_client->active == true)
-		return 0;
-
 	for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
 		if (vgasr_priv.clients[i].active == true) {
 			active = &vgasr_priv.clients[i];
@@ -372,6 +369,9 @@ vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf,
 		goto out;
 	}
 
+	if (client->active == true)
+		goto out;
+
 	/* okay we want a switch - test if devices are willing to switch */
 	can_switch = true;
 	for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index ade09d7b4271..c99c3d3e7811 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -127,7 +127,7 @@ void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 
 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
 
-bool drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
+int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper);
 int drm_fb_helper_debug_enter(struct fb_info *info);