2 files changed, 23 insertions, 5 deletions

diff --git a/drivers/staging/gma500/psb_drv.c b/drivers/staging/gma500/psb_drv.c
index 1c45c11a774e..aa87b1b6a44a 100644
--- a/drivers/staging/gma500/psb_drv.c
+++ b/drivers/staging/gma500/psb_drv.c
@@ -542,6 +542,8 @@ static int psb_driver_load(struct drm_device *dev, unsigned long chipset)
         unsigned long irqflags;
         int ret = -ENOMEM;
         uint32_t tt_pages;
+        struct drm_connector *connector;
+        struct psb_intel_output *psb_intel_output;
 
         dev_priv = kzalloc(sizeof(*dev_priv), GFP_KERNEL);
         if (dev_priv == NULL)
@@ -663,7 +665,18 @@ static int psb_driver_load(struct drm_device *dev, unsigned long chipset)
                 drm_kms_helper_poll_init(dev);
         }
 
-        ret = psb_backlight_init(dev);
+        /* Only add backlight support if we have LVDS output */
+        list_for_each_entry(connector, &dev->mode_config.connector_list,
+                            head) {
+                psb_intel_output = to_psb_intel_output(connector);
+
+                switch (psb_intel_output->type) {
+                case INTEL_OUTPUT_LVDS:
+                        ret = psb_backlight_init(dev);
+                        break;
+                }
+        }
+
         if (ret)
                 return ret;
 #if 0
diff --git a/drivers/staging/gma500/psb_intel_bios.c b/drivers/staging/gma500/psb_intel_bios.c
index 48ac8ba7f40b..417965da5e24 100644
--- a/drivers/staging/gma500/psb_intel_bios.c
+++ b/drivers/staging/gma500/psb_intel_bios.c
@@ -154,10 +154,15 @@ static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
 
         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 
-        dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
-
-        DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
-        drm_mode_debug_printmodeline(panel_fixed_mode);
+        if (panel_fixed_mode->htotal > 0 && panel_fixed_mode->vtotal > 0) {
+                dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
+                DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
+                drm_mode_debug_printmodeline(panel_fixed_mode);
+        } else {
+                DRM_DEBUG("Ignoring bogus LVDS VBT mode.\n");
+                dev_priv->lvds_vbt = 0;
+                kfree(panel_fixed_mode);
+        }
 
         return;
 }