[Intel-gfx] [PATCH] drm/i915: Fix LVDS presence check

[Adam Jackson]

Assume that either the presence of an LVDS entry in the VBT or an ACPI
lid device indicates an LVDS device.  ACPI lid alone is not sufficient.

Signed-off-by: Adam Jackson <ajax at redhat.com>
---
 drivers/gpu/drm/i915/intel_lvds.c |   17 ++++++-----------
 1 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 7f1e773..22ec5f7 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -977,19 +977,14 @@ void intel_lvds_init(struct drm_device *dev)
 	if (dmi_check_system(intel_no_lvds))
 		return;
 
-	if (!lvds_is_present_in_vbt(dev)) {
-		DRM_DEBUG_KMS("LVDS is not present in VBT\n");
-		return;
-	}
-	/* Assume that any device without an ACPI LID device also doesn't
-	 * have an integrated LVDS.  We would be better off parsing the BIOS
-	 * to get a reliable indicator, but that code isn't written yet.
-	 *
-	 * In the case of all-in-one desktops using LVDS that we've seen,
-	 * they're using SDVO LVDS.
+	/*
+	 * Assume LVDS is present if there's an ACPI lid device or if the
+	 * device is present in the VBT.
 	 */
-	if (!intel_lid_present())
+	if (!lvds_is_present_in_vbt(dev) && !intel_lid_present()) {
+		DRM_DEBUG_KMS("LVDS is not present in VBT and no lid detected\n");
 		return;
+	}
 
 	if (IS_IGDNG(dev)) {
 		if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
-- 
1.6.5.2