diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index c9b9ba4..1daf16d 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -798,11 +798,14 @@ static void intel_sdvo_get_mode_from_dtd(struct drm_display_mode * mode,
 
 	mode->clock = dtd->part1.clock * 10;
 
-	mode->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
-	if (dtd->part2.dtd_flags & 0x2)
-		mode->flags |= DRM_MODE_FLAG_PHSYNC;
-	if (dtd->part2.dtd_flags & 0x4)
-		mode->flags |= DRM_MODE_FLAG_PVSYNC;
+	DRM_DEBUG_KMS("mode->flags: %x, dtd_flags: %x\n", mode->flags, dtd->part2.dtd_flags);
+	mode->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC |
+			 DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
+	mode->flags |= dtd->part2.dtd_flags & 0x2 ?
+		       DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
+	mode->flags |= dtd->part2.dtd_flags & 0x4 ?
+		       DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
+	DRM_DEBUG_KMS("mode->flags2: %x\n", mode->flags);
 }
 
 static bool intel_sdvo_check_supp_encode(struct intel_sdvo *intel_sdvo)