--- a/drivers/gpu/drm/i915/intel_dp.c	2018-07-28 01:57:19.000000000 -0400
+++ b/drivers/gpu/drm/i915/intel_dp.c	2018-08-02 01:47:36.226528951 -0400
@@ -1845,15 +1845,15 @@
 	if (intel_conn_state->broadcast_rgb == INTEL_BROADCAST_RGB_AUTO) {
 		/*
 		 * See:
 		 * CEA-861-E - 5.1 Default Encoding Parameters
 		 * VESA DisplayPort Ver.1.2a - 5.1.1.1 Video Colorimetry
 		 */
 		pipe_config->limited_color_range =
-			bpp != 18 &&
+			(bpp != 18 && bpp != 24) &&
 			drm_default_rgb_quant_range(adjusted_mode) ==
 			HDMI_QUANTIZATION_RANGE_LIMITED;
 	} else {
 		pipe_config->limited_color_range =
 			intel_conn_state->broadcast_rgb == INTEL_BROADCAST_RGB_LIMITED;
 	}